This collection primarily contains architectural drawings, photographs, business records and reference materials related to the projects and designs of architectural and engineering firm Abbott, Merkt and Company. A subsidiary portion of the collection includes drawings, photographs and papers related to the career of Richard H. Tatlow, III, president of Abbott, Merkt & Co., and the firms and agencies for which he also worked; these include Harrington & Cortelyou, the Public Works Administration Records, United States. Dept. of Agriculture's Bureau of Public Roads, and the United States War Department. Records date from 1906 to 1994; the bulk are from between the 1950s and the 1970s.