 |
| English thesaurus | |||
| |||
| OB | |||
| Ordnance: 75 phrases in 13 subjects |
| Archaeology | 2 |
| Art | 1 |
| British usage, not spelling | 4 |
| Chemistry | 3 |
| Construction | 6 |
| General | 34 |
| Geophysics | 1 |
| Military | 1 |
| Mining | 2 |
| Optics branch of physics | 2 |
| Surveying | 3 |
| Travel | 1 |
| Weapons and gunsmithing | 15 |