http://dewey.info/scheme/edition/e23/ en
720.28 Auxiliary techniques and procedures; apparatus, equipment
720.284 Architectural drawing
http://dewey.info/scheme/edition/e22/ de
720.28 Unterst├╝tzende Techniken und Verfahren; Ger├Ąte, Ausstattung
720.284 Architekturzeichnung
Dewey Decimal Classification
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