http://dewey.info/scheme/e22/
600 Technology
690 Building & construction
690 Buildings 691 Building materials 692 Auxiliary construction practices 693 Specific materials & purposes 694 Wood construction & carpentry 695 Roof covering 696 Utilities 697 Heating, ventilating & air-conditioning 698 Detail finishing [699] [Unassigned]
Dewey Decimal Classification: Summaries
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