Distribution of iron ores of the Lake Superior district in the year 1909 / prepared by John Birkinbine ; U.S. Geological Survey, George Otis Smith, Director.
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Other Authors: | |
Language: | English |
Published: |
[Washington, D.C.] :
[Government Printing Office],
[1910?]
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Physical Description: | 1 map : color ; 62 x 92 cm |
Cartographic Data: | Scale 1:2,500,000. Approximately 40 miles to 1 in. (W 96°--W 66°/N 51°--N 35°). |
Format: | Map |
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