Subject
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Laws
2
Meteorology
2
Mine drainage
2
Models
2
Monitoring
2
Oaks
2
Offshore exploration
2
Parks
2
Peat
2
Petroleum
2
Power plants
2
Public opinion
2
Railroads
2
Research
2
Research and development
2
Riparian zones
2
Safety
2
Samplng
2
Shale
2
Spruce budworm
2
Statistics
2
Steam generation plants
2
Surface crown pillars
2
Sydney coalfield
2
Toxic materials
2
Underground mining
2
Walnut
2
Waste product utilization
2
Water quality
2
Watersheds
2
conservation
2
water quality
2
Abandoned Mines
1
Acid pollution of rivers, lakes, etc
1
Acid precipitation (Meteorology)
1
Air
1
Alkali metals
1
Alkalinity
1
Automobiles
1
Backfilling
1
Bats
1
Beavers
1
Bibliography
1
Biodiversity conservation
1
Bioenergy
1
Biological processes
1
Biomass conversion
1
Biotechnology
1
Bird feeders
1
Bison
1
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