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1874 A geological map of the Black Hills: by … Exploration Book A geological map of the Black Hills: by … |
1875 Drawings of new fossils found on a recon … Exploration Book Drawings of new fossils found on a recon … |
1874 Map of a reconnaissance of the Black Hil … Exploration Book Map of a reconnaissance of the Black Hil … |
1874 Map of the Black Hills from a reconnaiss … Exploration Book Map of the Black Hills from a reconnaiss … |