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Subject
- Geology396
- Description and travel66
- Paleontology36
- Mines and mineral resources30
- Natural history30
- Exploring expeditions25
- Geology, Stratigraphic16
- Botany15
- Mineralogy15
- Physical geography14
- History11
- Zoology11
- Agriculture8
- Gold mines and mining8
- Indians of North America7
- Volcanoes6
- Geological surveys5
- Antiquities4
- Beagle Expedition4
- Bible and geology4