Category:Old geological maps of South Dakota
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This category has only the following subcategory.
Media in category "Old geological maps of South Dakota"
The following 14 files are in this category, out of 14 total.
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Cenozoic mammal horizons of western North America BHL45549327.jpg 3,645 × 2,970; 1.27 MB
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Lake Agassiz, southern outlet.jpg 624 × 950; 220 KB