| GB 10 |
Dictionaries. Encyclopedias |
| GB 400-649 |
Geomorphology. Landforms. Terrain |
| - GB 447 |
- Climatic geomorphology |
| - GB 450-460 |
- Coasts |
| - GB 461-468.995 |
- Reefs |
| - GB 471-478.995 |
- Islands |
| - GB 500-555 |
- Mountains. Orography |
| - GB 561-649 |
- Other natural landforms: Floodplains,
caves, deserts, dunes etc. |
| GB 651-2998 |
Hydrology. Water |
| - GB 980-2998 |
- Ground & surface waters |
| - - GB 980-992 |
- - Watersheds. Runoff. Drainage |
| - - GB 1001-1199.8 |
- - Groundwater. Hydrogeology |
| - - GB 1201-1598 |
- - Rivers. Stream measurements |
| - - GB 1601-2398 |
- - Lakes. Limnology. Ponds. Lagoons |
| - - GB 2401-2598 |
- - Ice. Glaciers. Ice sheets. Sea ice |
| - - GB 2801-2998 |
- - Hydrometeorology |
| GB 5000-5030 |
Natural disasters |