Von Duyke, Andrew. 2006. Summary Report: Monitoring, Research, and Management Activities at the Peltier Island Heronry During 2004 and 2005 Field Seasons. Final report to the U.S. Fish and Wildlife Service, State Wildlife Grants Program. http://files.dnr.state.mn.us/eco/nongame/projects/consgrant_reports/2006/swg_2006_von_duyke.pdf