Subject
- Economic conditions2
- Europe2
- Forests and forestry2
- Fortification2
- Franco-Prussian War, 1870-18712
- Geography2
- Geology, Structural2
- Geomagnetism2
- Geomorphology2
- Glaciers2
- International relations2
- Landforms2
- Migrations2
- Power resources2
- Road maps2
- Shipping2
- Telegraph lines2
- Topographic maps2
- Trade routes2
- Aeronautics, Commercial1
