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Geology -- United States --Maps (51) |
Neogene - unnamed strata (51) |
Paleogene - unnamed strata (11) |
Carboniferous - Calaveras formation (7) |
Cretaceous - unnamed strata (5) |
Triassic - Spearfish formation (5) |
Cambrian - Deadwood formation (4) |
Geology--California--Maps (4) |
Geology--Pennsylvania--Maps (4) |
Geology--Illinois--Maps (3) |