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Subject
- Roads20
- Great Britain. Colonial Office9
- Harbors5
- Beach erosion4
- Coast changes4
- Indigenous peoples of North America4
- Census districts3
- Metropolitan areas3
- Geomagnetism2
- Groundwater2
- Real property2
- Agricultural pollution1
- Atlases1
- Flood dams and reservoirs1
- Floodplains1
- Floods1
- Fortification1
- Geological Survey (U.S.)1
- Geology1
- Gravity1