Topics
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Petroleum industry and trade
15
Planning
6
Population forecasting
16
Power utilization
3
Power-plants
1
Prices
3
Railroads
1
Recreational use
2
Recycling (Waste, etc.)
1
Regional economics
2
Research
3
Roads
1
Route surveying
1
Slash (Logging)
1
Social aspects
16
Social conditions
5
Social surveys
1
Sociological aspects
2
Telephone surveys
1
Transportation
3
Wilderness areas
2