Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 421
MANY PRACTICAL POSITIONS FOR REVOLVING DOORS IN ENTRANCES Standard types of walls, ceiling and wings, each described by letter and number, permit of a large number of combinations, a sufficent numberof which are here illustrated to permit the architect to make a selection, or to make any other…
Building materials
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