MapThe twin ports, Superior, Wisconsin, Duluth, Minnesota. Perspective map not drawn to scale. Bird's-eye-view. LC Panoramic maps (2nd ed.), 1060 Available also through the Library of Congress Web site as a raster image. AACR2: 100; 651/1; 651/2
- Contributor: Wellge, H. (Henry) - Freeman Eng. Co. - Northern Scenic Publishing Company - Wellge, H.
- Date: 1915