http://dewey.info/scheme/edition/e23/ en
720.4 Special topics of architecture
720.47 Architecture and the environment
720.472 Energy resources 720.473 Earth-sheltered buildings 720.475 Waste technology
http://dewey.info/scheme/edition/e22/ de
720.4 Spezielle Themen der Architektur
720.47 Architektur und Umwelt
720.472 Energiequellen 720.473 Unterirdische Bauten 720.475 Abfalltechnik
Dewey Decimal Classification
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