Subject
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Waterfowl
22
Woodlands
22
Biotic communities
21
Coal deposits
21
Coal mines and mining
21
Computer programs
21
Energy policy
21
Gasification
21
Geophysical methods
21
Guidelines
21
Jack pine
21
Paleozoic
21
Products
21
Sedimentary basins
21
Task force
21
Tides
21
Weed control
21
Biodiversity conservation
20
Carbonate rocks
20
Coastal zone Management
20
Communities
20
Continental margin
20
Criminal law
20
Deformation
20
Equipment
20
Evaporites
20
Exports
20
Fertilizers
20
Genealogy
20
Geologic history
20
Norway spruce
20
Quality
20
Royalties
20
Storage
20
Utilization
20
Vegetation
20
Aerial photography
19
Agreements
19
Clean coal
19
Cogeneration
19
Deposition
19
Field guides
19
Foresters
19
Genetics
19
Glaciation
19
Gold mining
19
Industrial safety
19
Labour
19
Modelling
19
Nature
19
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