Collection consists of 39 black and white photographs mounted on cloth backing, which were originally bound in a booklet. The photographs, dating between approximately 1915 and 1920, depict scenes of the Peninsula Industrial District in North Portland, Oregon, and surrounding neighborhoods. Stamped on the back of one image and the original booklet cover is the text: "Alfred A. Aya, Industrial Agent / Peninsula Industrial District / Corbett Building, Portland, Oregon." Most of the photographs depict mills, factories, and other industrial facilities, and include identifying information in the image. Identified places and businesses include the Coast Culvert & Flume Co.; the Columbia Sub-Station of the Portland Railway, Light, and Power Company; the L. Moore Dry Kiln Co.; the Livestock Exchange; the Millmade Construction Co.; the Monarch Mill; National Tank and Pipe Co.; the Nicolai Door Manufacturing Co.; North Portland Box Company facilities; the North Portland harbor; the Oregon Scouring Mills; the Pacific Cement Pipe Co.; the Porter-Scarpelli Macaroni Co.; Portland Stove Works; the Portland Union Stockyards; the Standifer shipyard; the Swift & Co. packing plant; the West Coast Box & Lumber Co.; and the Western Spar Co. The photographs also include unidentified residential scenes and buildings. The photographer or photographers are unidentified.