| Call Number | Subject |
|---|---|
| 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 |