http://dewey.info/scheme/a14/ en
333.7 Land, recreational and wilderness areas, energy
333.72 Conservation and protection
333.72092 Conservationists
http://dewey.info/scheme/a14/ vi
333.7 Đất đai, khu vực giải trí và khu vực hoang dã, năng lượng
333.72 Bảo tồn và bảo vệ
333.72092 Người bảo tồn thiên nhiên
http://dewey.info/scheme/a14/ it
333.7 Terra, aree per attività ricreative e aree allo stato naturale, energia
333.72 Conservazione e tutela
333.72092 Ambientalisti
http://dewey.info/scheme/edition/e23/ en
333.7 Land, recreational and wilderness areas, energy
333.72 Conservation and protection
333.72092 Conservationists
Dewey Decimal Classification
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