Subject
- Hungarians2
- Iron industry and trade2
- Metal trade2
- Mines and mineral resources2
- Natural gas2
- Oil fields2
- Petroleum2
- Rice2
- Shipping2
- Steel industry and trade2
- Streets2
- Telecommunication2
- Waterways2
- Aeronautical charts1
- Agricultural geography1
- Agriculture1
- Air bases1
- Ardennes, Battle of the, 1944-19451
- Boats and boating1
- Cambrian Geologic Period1
