Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 169
r cr; ^ ^ ?r ■3^&n7(F:s/? <^^ /7/r-< la 1 erAM5 fc c-poc … SYSTEM A, TYPE IIAuthorized for use by the Bureau of Buildings, New York Cit\-, for load of 350 lbs. per square foot. Factor of Safetj- of Ten. f^^^fWjj ^jjv?y/j^gfa^NMii>g,A.| //^aocj ^/ccr^cT^
Building materials
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