1. Chippewa National Forest, Minnesota : 1941 Maps University Of Minnesota Public content 1941. Simerl, R. A. and United States. Forest Service. Cartographic Details: Scale [1:130,000] ; Polyconic projection (W 94°0'--W 93°18'/N 48°00'--N 46°0'). "Fourth and fifth principal meridians." 99 x... The Office; Milwaukee, Wisconsin.