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Roads
2
Runways (Aeronautics)
2
Salt mines and mining
2
Sand
2
Soil and civilization
2
Sports facilities
2
Structure
2
Swamps
2
Trails
2
Trees
2
Vegetation boundaries
2
Vegetation classification
2
Embankments
1
Fills (Earthwork)
1
Fuelbreaks
1
Glaciers
1
Hydraulic structures
1
Ice
1
Ice sheets
1
Industrial sites
1