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Quality
2
Quality control
2
Racetracks
1
Railroads
1
Recreation areas
2
Reservoirs
1
Roads
1
Runways (Aeronautics)
2
Salt mines and mining
1
Sports facilities
1
Storage tanks
1
Structure
3
Swamps
1
Telephone cables
1
Topographic maps
2
Towers
2
Transportation
9
Trees
1
Vegetation and climate
1
Vegetation boundaries
2