Meyer, Gary N., Jirsa, Mark A., Jennings, Carrie E.. (2005). Aggregate resource potential of Itasca County, Minnesota, M-131, Plate 1. Minnesota Geological Survey. https://reflections.mndigital.org/catalog/mgs:849

Available from: https://geo.btaa.org/catalog/d88e83a1-936f-4644-8328-662c15f1982d