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Subject
Roads
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12
Transportation
11
Streets
7
Inland Waters
6
Structure
6
Bridges
5
Hydrography
5
Railroads
5
Rivers
5
Trails
5
Asphalt
2
Cities and towns
2
Concrete
2
Environment
2
Express highways
2
Metropolitan areas
2
Pavements
2
Soil compaction
2
Agriculture
1
Biology and Ecology
1