View of Cass Avenue lawn being excavated for lawn sprinklers at Main Library, Detroit Public Library. Automobiles parked in driveway; tractor in center of area. Printed on front: "Detroit Library Commission. Addns & alterations to Main Public Library. Bryant & Detwiler Company, contr. Descr. Cass Ave. excavation for lawn sprinklers, looking north. No. 190. Date: 8-21-62. Win Brunner, photo."