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Subject
- Natural history51
- Description and travel9
- Natural history museums6
- National parks and reserves5
- Ecology4
- Museums4
- Geology3
- Paleontology3
- Sciences naturelles3
- Continental shelf2
- Discovery and exploration2
- Eskimos2
- Exploring expeditions2
- History2
- Indians of North America2
- Law and legislation2
- Mammals2
- National Museum of Natural History (U.S.)2
- Outdoor recreation2
- United States. National Park Service2