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Environment
3
Structure
2
Bridges
1
Dams
1
Fuelbreaks
1
Geysers
1
Hot springs
1
Hydraulic structures
1
Inland Waters
1
Oil storage tanks
1
Parks
1
Physiographys
1
Pipelines
1
Rapids
1
Recreation areas
1
Refuse and refuse disposal
1
Rivers
1
Storage tanks
1
Transportation
1
Waste disposal sites
1