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- Agriculture 1
- Audubon societies 1
- Bears 1
- Birds--Conservation 2
- Birds--Conservation--Law and legislation 1
- Black bear 1
- Burning of land 1
- Conservation of natural resources 5
- Conservation of natural resources--Law and legislation 1
- Deers 1
- Fishes--Conservation 1
- Fishing 1
- Forests and forestry 1
- Fur-bearing animals 1
- Game and game-birds 3
- Geological Survey (U.S.) 1
- Groundwater 1
- Hunting 3
- Izaak Walton League of America 2
- Laboratories 5