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Subject
- Paleontology[remove]117
- Geology62
- Cretaceous Geologic Period21
- Geology, Stratigraphic21
- Description and travel16
- Zoology16
- Discovery and exploration14
- Botany12
- Ammonoidea10
- Exploring expeditions10
- Fossils10
- Ostracoda, Fossil9
- Foraminifera, Fossil8
- Geological surveys7
- Indians of North America7
- Discoveries in geography6
- Mines and mineral resources6
- Mollusks, Fossil6
- American5
- Astronomy5