observation station: 29 phrases in 15 subjects |
Abbreviation | 1 |
Artillery | 1 |
Astronautics | 5 |
Cartography | 2 |
Construction | 1 |
Ecology | 2 |
Elections | 3 |
General | 1 |
Geology | 1 |
Hydrology | 1 |
Meteorology | 2 |
Military | 5 |
Missiles | 1 |
Technology | 2 |
Water resources | 1 |