original american 1950's interior chicago athletic club association building lobby "phone directory" listing several prominent hotels, department stores, theaters, railroad terminals, etc. the directory utilizes the telephone exchange system consisting of of two letters and five digits (i.e., designated as the 2l-5n numbering plan). two identical framed directories were salvaged from the association building lobby. the printed sheet is protected under clear glass frames with varnished pine wood. priced individually. measures approximately 12 x 14 inches.