Map showing the Pioneer iron mine, surveyed July 13, 1889, scale 1 inch = about 6.25 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23265.pdf
Map showing iron mines in the Vermilion range, scale 1 inch = about 0.12 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23264.pdf
Map of northeastern Minnesota showing iron regions, scale 1 inch = about 4.5 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23263.pdf
Map showing the Pioneer iron mine, surveyed July 13, 1889, scale 1 inch = about 6.25 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23265.pdf
Sheet 2, Map of the Surface (glacial landforms) Formations and agricultural conditions of northeastern Minnesota, scale 1:500,000. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23267.pdf
Map of East Central Minnesota showing location of rock outcrops (location of rocks exposed at the land surface), scale 1 inch = 10 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23269.pdf
Map of the principal part of the Cuyuna Iron-ore District, showing the distribution of known iron-bearing rocks and lines of maximum magnetic attraction, scale 1 inch = 1 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23270.pdf
Map and sections showing the geology and workings of the Rowe Mine, Cuyuna Iron-ore District, surveyed in July, 1915, scale 1 inch = about 130 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23271.pdf
Map and sections showing the geology and workings of the Pennington, Armour No. 1, and Armour No. 2 Mines, Cuyuna Iron-ore District, Minnesota, surveyed in July, 1915, scale 1 inch = about 130 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23272.pdf
Map and sections showing the geology and workings of the Thompson Mine, Cuyuna Iron-ore District, surveyed July, 1915, scale 1 inch = 130 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23273.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Eastern Mesabi District, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23278.pdf
Peat Deposits of Beltrami County, Minnesota, showing location of soundings and depth of peat and topography of the surface of the bogs north of Red Lake, scale 1 inch = about 4 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23275.pdf
Peat Deposits of Koochiching County Minnesota, showing locations of drainage ditches, scale 1 inch = about 4 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23276.pdf
Map showing Peat Deposits of Itasca County Minnesota, scale 1 inch = about 4 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23277.pdf
Sheet 3, Map of the Surface (glacial landforms) Formations and agricultural conditions of the southern half of Minnesota, scale 1:500,000. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23268.pdf
Longitudinal Section through the Biwabik and Gunflint Formations, scale 1 inch = 1.5 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23280.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Western Mesabi District, Minnesota, scale 1:62,500. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23279.pdf
Geologic map of Minnesota, scale 1:500,000, northern half of Minnesota. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn22594.pdf
Geologic map of Minnesota, scale 1:500,000, southern half of Minnesota. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn22595.pdf
East-West Cross Sections of the Metropolitan Area, scale 1 inch = about 15,000 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23282.pdf
North-South Cross Sections of the Metropolitan Area, scale 1 inch = about 13,000 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23283.pdf
Map of the Glacial (Quaternary glacial and stream sediments) Deposits of the Metropolitan Area, scale 1 inch = about 4 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23284.pdf
Structural Contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Minneapolis-St. Paul Artesian Basin, scale 1 inch = about 4 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23285.pdf
Map of Minneapolis showing the rock surface topography (elevation of the bedrock surface), scale 1 inch = about 2,250 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23286.pdf
Map of Saint Paul showing the rock surface topography, (elevation of the bedrock surface), scale 1 inch = about 2,500 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23287.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Minneapolis-St. Paul Metropolitan District, scale 1:96,000. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23281.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Townships 54 and 55 North, Ranges 7 and 8 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23288.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Townships 56 North, Range 7 West and a portion of Township 56 North, Range 8 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23289.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 57 North, Ranges 6 and 7 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23290.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 58 North, Range 6 West and a portion of Township 58 North, Range 7 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23291.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of a portion of Township 59 North, Range 6 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23292.pdf
Structural (recognizable features produced by deformation of rocks) map of anorthosite occurrence, scale 1 inch = about 2 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23293.pdf
Maps showing sequence of geologic units (beds) alongshore from Mesaba Avenue to Beyond Lakewood, scale 1 inch = about 1,800 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23294.pdf
Maps showing sequence of geologic units (beds) alongshore from Duluth East City Limits to Near Knife River, scale 1 inch = about 1800 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23295.pdf
Maps showing sequence of geologic units (beds) alongshore from Knife River to Two Harbors, scale 1 inch = about 1,800 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23296.pdf
Map of glacial (Quaternary age glacial and stream sediments) deposits of the Duluth Metropolitan Area, scale 1 inch = about 4 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23297.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 48 North, Range 15 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23298.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 48 North, Range 16 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23299.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 48 North, Range 17 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23300.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 51 North, Range 14 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23308.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 51 North, Range 15 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23309.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 52 North, Range 11 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23310.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 52 North, Range 12 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23311.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 52 North, Range 13 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23312.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Townships 49 and 50 North, Range 14 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23304.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 50 North, Range 15 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23305.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 51 North, Range 12 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23306.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 51 North, Range 13 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23307.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 49 North, Range 16 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23302.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 49 North, Range 17 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23303.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 49 North, Range 15 West, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23301.pdf
Sheet 1 of 4 sheets, Stratigraphy (vertical and time sequence of geologic units) of Biwabik Formation, Mesabi Range, Minnesota, scale 1 inch = 11.2 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23319.pdf
Sheet 4 of 4 sheets, Stratigraphy (vertical and time sequence of geologic units) of Biwabik Formation, Mesabi Range, Minnesota, scale 1 inch = 11.2 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23322.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Precambrian of the Westernmost Mesabi District, Minnesota, scale 1:62,500. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23323.pdf
Sheet 1 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23324.pdf
Sheet 2 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23325.pdf
Sheet 3 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23326.pdf
Sheet 4 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23327.pdf
Sheet 5 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23328.pdf
Sheet 6 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23329.pdf
Sheet 7 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23330.pdf
Sheet 8 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23331.pdf
Sheet 9 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23332.pdf
Sheet 10 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23333.pdf
Sheet 11 of 11 sheets, Structure contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Mesabi Range, Minnesota, scale 1:31,250. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23334.pdf
Map of the thickness of drift (thickness of unconsolidated sediments overlying the bedrock surface, Mesabi Range, Minnesota, scale 1:125,000. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23335.pdf
Sheet 2 of 4 sheets, Stratigraphy (vertical and time sequence of geologic units) of Biwabik Formation, Mesabi Range, Minnesota, scale 1 inch = 11.2 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23320.pdf
Sheet 3 of 4 sheets, Stratigraphy (vertical and time sequence of geologic units) of Biwabik Formation, Mesabi Range, Minnesota, scale 1 inch = 11.2 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23321.pdf
Diagram showing correlation of subdivisions of Iron-Formations Cuyuna, Mesabi, and Gogebic Ranges, Minnesota, , vertical scale 1 inch = about 200 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23318.pdf
Cross section B-B, geology of the Cuyuna Range, Minnesota, scale 1 inch = 500 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23315.pdf
Cross sections A-A and C-C, geology of the Cuyuna Range, Minnesota, scale 1 inch = 500 feet. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23316.pdf
Map of west extension of South Range, Cuyuna Iron District, Minnesota, scale 1 inch = about 3/4 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23317.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) around the Cuyuna district, Minnesota, scale 1 inch = 15 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23313.pdf
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) the Cuyuna Iron District, North Range and part of South Range, Crow Wing County, Minnesota, scale 1 inch = about 1/3 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23314.pdf
Glacial (Quaternary age glacial and stream sediments and landforms) features of Cook County, Minnesota, scale 1 inch = 5 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23336.pdf
Plate 5, Sequence of volcanic lava flows along shore from the Lake County line to Good Harbor Bay, Minnesota, scale 1 inch = about 3/4 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23341.pdf
Plate 6, Geology map of Township 64 North, Range 5 East, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23342.pdf
Plate 7, Geology map of Township 63 North, Range 5 East, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23343.pdf
Plate 8, Geology map of Townships 61 and 62 North, Range 3 East, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23344.pdf
Plate 9, Geology map of Township 62 North, Range 4 East, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23345.pdf
Plate 10, Geology map of Townships 60 and 61 North, Range 1 West, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23346.pdf
Plate 11, Geology map of Township 61 North, Range 1 East, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23347.pdf
Plate 12, Geology map of parts of Townships 61 and 62 North, Range 2 East, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23348.pdf
Plate 13, Geology map of Townships 59 and 60 North, Range 3 West, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23349.pdf
Plate 14, Geology map of Township 60 North, Range 2 West, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23350.pdf
Plate 16, Geology map of Township 58 North, Range 5 West, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23352.pdf
Plate 3A, Geology of the Gunflint District, Minnesota, scale 1:24000. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23339.pdf
Plate 4, Sequence of volcanic lava flows along shore from Good Harbor Bay to Grand Portage Bay, Minnesota, scale 1 inch = about 3/4 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23340.pdf
Plate 15, Geology map of Township 59 North, Range 4 West, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23351.pdf
Pleistocene (Quaternary age glacial and stream sediments) geology of the Randall Region, Minnesota, scale 1:62,500. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23353.pdf
Goldich, Sam S.; Nier, Al O.; Baadsgaard, H.; Hoffman, J.H.; Krueger, H.W.
Date Created:
1961
Description:
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of northeastern Minnesota, scale 1 inch = about 15 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23354.pdf
Goldich, Sam S.; Nier, Al O.; Baadsgaard, H.; Hoffman, J.H.; Krueger, H.W.
Date Created:
1961
Description:
Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of east-central Minnesota, scale 1 inch = about 10 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23355.pdf
Goldich, Sam S.; Nier, Al O.; Baadsgaard, H.; Hoffman, J.H.; Krueger, H.W.
Date Created:
1961
Description:
Map of the Minnesota-Ontario border region, showing location of dated samples, scale 1 inch = about 20 miles. Electronic file available at: ftp://mgsftp2.mngs.umn.edu/map_catalog/pdf/umn23356.pdf