Roy, Charlotte L. 2013. “Investigation of Trematodes and Faucet Snails Responsible for Lesser Scaup Die-Offs.” In Summaries of Wildlife Research Findings 2013, edited by Lou Cornicelli, Michelle Carstensen, Marrett D. Grund, Michael A. Larson, and Jeffrey S. Lawrence, 159–165. St. Paul: Minnesota Department of Natural Resources. http://files.dnr.state.mn.us/publications/wildlife/research2013/wetlands.pdf - view=fit&pagemode=bookmarks