http://dewey.info/scheme/edition/e23/ en
697 Heating, ventilating, air-conditioning engineering
697.1 Heating with open fires (Radiative heating)
http://dewey.info/scheme/edition/e22/ de
697 Heizungs-, L├╝ftungs-, Klimatechnik
697.1 Heizen mit offenem Feuer (Strahlungsheizung)
Dewey Decimal Classification
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