View of ductwork installed on B-level, North Wing, Main Library, Detroit Public Library during construction. Handwritten on column: "N30." Printed on front: "Detroit Library Commission. Addns & alterations to Main Public Library. Bryant & Detwiler Company, contr. Descr. No. Wing duct, B-level. No. 36. Date: 3-30-61. Win Brunner, photo."
