Cores taken from Springwells tunnel, Detroit water supply system
Grab
Description
View of cores taken from Springwells tunnel, Detroit water supply system." Sign in foreground reads: "Cores taken from springing line. City of Detroit. Department of Water Supply. Bureau of Land Tunnels. Core borings from lining of Springwells tunnel. Contract section 3-B." Printed on front: "2-27-28."