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Subclass GB
GB3-5030 | Physical geography | |||
GB400-649 | Geomorphology. Landforms. Terrain | |||
GB447 | Climatic geomorphology | |||
GB448 | Slopes | |||
GB450-460 | Coasts | |||
GB461-468.995 | Reefs | |||
GB471-478.995 | Islands | |||
GB500-555 | Mountains. Orography | |||
GB561-649 | Other natural landforms: Floodplains, caves, deserts, dunes, etc. | |||
GB651-2998 | Hydrology. Water | |||
GB980-2998 | Ground and surface waters | |||
GB980-992 | Watersheds. Runoff. Drainage | |||
GB1001-1199.8 | Groundwater. Hydrogeology | |||
GB1201-1598 | Rivers. Stream measurements | |||
GB1601-2398 | Lakes. Limnology. Ponds. Lagoons | |||
GB2401-2598 | Ice. Glaciers. Ice sheets. Sea ice | |||
GB2601-2798 | Snow. Snow surveys | |||
GB2801-2998 | Hydrometeorology | |||
GB5000-5030 | Natural disasters |