Subject
- Military bases12
- National parks and reserves12
- Cities and towns10
- Forest reserves10
- Highway planning10
- British9
- Mines and mineral resources9
- Public lands9
- Canals8
- Geological cross sections8
- Territorial expansion8
- Discovery and exploration7
- French7
- Gettysburg, Battle of, Gettysburg, Pa., 18637
- Campaigns6
- Description and travel6
- Distances6
- Earthquakes6
- Groundwater6
- Income6
