Cartographic Details: Scale [1:5,280] 12 in. = 1 mi. Insets: Fig. 2. Profile on A.B.C. -- Fig. 3. Cross section of the causey. D. Chillas, Lith.33 x 28 centimetersJPEGUMN_ALMA:9921045210001701engPublisher not identified (Place of publication not identified)PublicHarbor of Dubuque.MapsIowa--DubuqueIowa1854University of Minnesota