Goodermote, Donald L. 1989. A Survey of Nesting Herring Gulls on Selected Sites Along the North Shore of Lake Superior, from Knife River to the Pigeon River – 1989. Minnesota Department of Natural Resources, Nongame Wildlife Program. http://files.dnr.state.mn.us/eco/nongame/projects/consgrant_reports/1989/1989_goodermote.pdf