Goodermote, Donald L. 1984. A Survey of Nesting Herring Gulls Along the North Shore of Lake Superior from Knife River to the Pigeon River, During the Period 1977–1984. Minnesota Department of Natural Resources, Nongame Wildlife Program. http://files.dnr.state.mn.us/eco/nongame/projects/consgrant_reports/1984/1984_goodermote.pdf