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Subject
- Geology8
- Conifers2
- Geological time2
- Phytogeography2
- Woody plants2
- Census districts1
- Eskimos1
- Formations (Geology)1
- Geochemical prospecting1
- Geomagnetism1
- Gravity anomalies1
- Indigenous peoples of North America1
- Mines and mineral resources1
- National parks and reserves1
- Radon1
- Sedimentary rocks1
- Thermal analysis in earth sciences1