http://dewey.info/scheme/a14/ en
631 Specific techniques; apparatus, equipment, materials
631.7 Water conservation
http://dewey.info/scheme/a14/ vi
631 Kỹ thuật cụ thể; máy móc, thiết bị, vật liệu
631.7 Bảo tồn nước
http://dewey.info/scheme/a14/ it
631 Specifiche tecniche; apparecchi, attrezzature, materiali
631.7 Risparmio idrico
http://dewey.info/scheme/edition/e23/ en
631 Specific techniques; apparatus, equipment, materials
631.7 Water conservation
http://dewey.info/scheme/edition/e22/ de
631 Einzelne Techniken; Geräte, Ausstattung, Materialien
631.7 Gewässerschutz
Dewey Decimal Classification
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