de
628 Sanitärtechnik
628.5 Umweltschutztechnik und Sanitärtechnik in der Industrie
628.51 Sanitärtechnik in der Industrie 628.52 Einzelne Arten von Schadstoffen 628.53 Luftverschmutzung 628.55 Bodenverschmutzung
Dewey Decimal Classification
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