en
72 Architecture
721 Architectural materials and structural elements
721.04 Architectural materials 721.1 Foundations 721.2 Walls 721.3 Columnar constructions 721.4 Curved constructions and details 721.5 Roofs and roof structures 721.6 Floors 721.7 Ceilings 721.8 Other elements
Dewey Decimal Classification
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