11. Wisconsin, transportation map, highways, railroads, canals, air lanes, and dredged channels; highways corrected to Apr. 1, 1939. Scale 1:250,000, approximately 1 in.=4 m. Bookmark Corporate/Agency Authors: Public Roads Bureau Publisher: Public Roads Bureau Date: 1939 SuDoc number: A 22.9/2:W 75/sh.1-9