Sub-category Terms for "popular geology"
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- areal geology
- building stones
- earth history
- earth science
- field trips
- fossil collecting
- gem collecting
- general geology
- history
- invertebrate paleontology
- lakes and reservoirs
- landscapes
- mineral collecting
- mining
- natural features
- paleobotany
- petroleum
- petroleum exploration
- rivers and streams
- rock collecting
- Unknown
- vertebrate paleontology
- water resources