View of Springwells tunnel showing timbering, Detroit water supply system. Printed on front: "Job, Springwells tunnel. Sec 2. Photo no. 25. Sept. 27, 1927. View of west heading showing timbering. Geo. R. Cooke Co., contractors." Stamped on back: "American Commercial Photo Co. 25 Parsons St. Detroit, Mich. Glendale 7152."