Excavation for Cass Avenue sewer, Main Library, Detroit Public Library. Construction workers stand next to power shovel; bulldozer in background. Printed on front: "Detroit Library Commission. Addn's & alterations to Main Public Library. O.W. Burke Co., contractor. Descr. excavation for Cass Ave. sewer. No. 5. Date 9-4-58. Win Brunner, photo."