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Railroads
1
Rapids
2
Reefs
1
Refuse and refuse disposal
1
Reservoirs
1
Rivers
2
Roads
1
Runways (Aeronautics)
1
Salt mines and mining
1
Sand
1
Soil and civilization
1
Sports facilities
1
Storage tanks
1
Structure
2
Swamps
1
Topographic maps
3
Towers
2
Trails
1
Transportation
7
Trees
1