In addition to magazine articles and roughly 150 monthly newsletters for the Lac du Flambeau Ojibwe community, my publications from a previous life include:
Behavior of free-ranging and captive river otters in northcentral Wisconsin. Ph.D. Thesis, 1982. University of Minnesota, Minneapolis, MN, 191 p.
“Wrestling play in adult river otters, Lutra canadensis.” Journal of Mammalogy 72(2): 386-390, 1991.
Breaking New Waters: A Century of Limnology at the University of Wisconsin (Transactions of the Wisconsin Academy of Sciences, Arts, and Letters, 1987). The book can be purchased from the Center for Limnology, University of Wisconsin-Madison, 608-262-3014.
Annamarie Beckel 
Hello! I am a graduate student at Cal Poly Humboldt in California studying river otters. I found access to the first 24 pages of your dissertation “Behavior of free-ranging and captive river otters in Northcentral Wisconsin” but I cannot find a full version without a paywall. Would you mind sharing a copy with you?
Please contact me through the contact in this website so that I have your email address. I don’t have a copy of the dissertation to send you–I would have to make a photocopy. Before I do that, please contact the University of Minnesota library directly and see if they can make a digital copy available to you. Good luck with your research.