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- Paleontology19
- Geology, Stratigraphic17
- Geology12
- Ammonoidea6
- Dinosaurs5
- Amusement parks3
- Paleogeography3
- Crichton, Michael, 1942-20082
- Molecular cloning2
- Paleobiogeography2
- Paleobotany2
- Paleoecology2
- Rescue work2
- Survival2
- Vertebrates, Fossil2
- Volcanoes2
- Allan, John Andrew, 1884-19551
- Ammonoidea, Fossil1
- Brachiopoda, Fossil1
- Natural gas1