363.7 Environmental problems
363.72 Sanitation
363.7209173 Rural sanitation vi
363.7 Vấn đề môi trường
363.72 Vệ sinh
363.7209173 Vệ sinh nông thôn it
363.7 Problemi ambientali
363.72 Igiene pubblica
363.7209173 Igiene rurale en
363.7 Environmental problems
363.72 Sanitation
363.72091734 Rural sanitation 363.728 Wastes 363.729 Sanitation in specific environments de
363.7 Umweltprobleme
363.72 Sanitäranlagen
363.72091734 Ländliche Sanitäranlagen 363.728 Abfälle 363.729 Sanitäranlagen in einzelnen Umgebungen
Dewey Decimal Classification
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