639 Hunting, fishing, conservation, related technologies
639.9 Conservation of biological resources
639.90284 Animals--conservation technology--equipment 639.9091733 Animals--conservation technology--suburban areas 639.9092 Conservationists--of biological resources--technologists 639.92 Habitat improvement 639.93 Population control 639.95 Maintenance of reserves and refuges 639.96 Control of injuries, diseases, pests 639.97 Specific kinds of animals 639.99 Plant conservation
Dewey Decimal Classification
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