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Subject
- Geology1,550
- Groundwater245
- Coal176
- Geomagnetism120
- Aquifers93
- Mines and mineral resources72
- Geology, Stratigraphic67
- Magnetic anomalies67
- Cartes55
- GeĢologie54
- Geology, Structural31
- Water table31
- Petrology28
- Nautical charts27
- Water quality27
- Transportation25
- CO24
- Federal aid to transportation24
- Sediments (Geology)24
- Landslides20
