Dennee, Phyllis, Geological Survey (U.S.), Good, L. S., Sealing, H. E., United States. Forest Service (1924). Superior National Forest, Minnesota 4th principal meridian, 1924. U.S. Dept. of Agriculture, Forest Service; Washington, D.C.. https://umedia.lib.umn.edu/item/p16022coll247:140 (map)