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Subject
- Recreation areas1
- Remote-sensing maps1
- Rivers1
- Sediment compaction1
- Shipwrecks1
- Soil compaction1
- Soil moisture1
- Soil permeability1
- Soils1
- Street-railroads1
- Tertiary Geologic Period1
- Texan Santa Fé Expedition, 18411
- Timber1
- Triangulation1
- Vegetation mapping1
- Water chemistry1
- Water quality1
- Water quality monitoring stations1
- Water use1
- Wildlife conservation1
