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ลำดับที่LC คำอธิบาย
Groundwater. Hydrogeology
Rivers. Stream measurements
Lakes. Limnology. Ponds. Lagoons
Ice. Glaciers. Ice sheets. Sea ice
Snow. Snow surveys
Hydrometeorology
Physical geography
Geomorphology. Landforms. Terrain
Climatic geomorphology
Slopes
Coasts
Reefs
Islands
Mountains. Orography
Natural disasters
Other natural landforms: Floodplains, caves, deserts, dunes, etc.
Hydrology. Water
Ground and surface waters
Watersheds. Runoff. Drainage
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