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Bellrose, F.C. 1976. Ducks, geese and swans of North America. 2nd ed. Stackpole
     Books, Harrisburg, PA. 543 pp

Doty, H.A., F.B. Lee and A.D. Kruse. 1975. Use of elevated nest baskets by 
     ducks. Wildlife Society Bulletin. 3:68-73.

Henderson, C.L. 1985. Woodworking for Wildlife. Minnesota Department of Natural
     Resources. Nongame Wildlife Program. 48 pp.

Johnsgard, P.A. 1975. Waterfowl of North America. Indiana University Press,
     Bloomington. 575 pp.

Lee, F.B. 1982. Homemade Nesting sites for Mallards. North Dakota Outdoors, 
     44 (9):6-9.

Lee, F.B., C.H. Schroeder, T.L. Kuck, L.J. Schoonover, M.A. Johnson, H.K. 
     Nelson, and C.A. Beauduy. 1984. Rearing and Restoring Giant Canada Geese in
     the Dakotas. North Dakota Game and Fish Department, Bismarck.  79 pp.

Messmer, T.A., M.A. Johnson, and F.B. Lee. 1988. Homemade Nest Sites for Giant
     Canada Geese. NDSU Extension Service, Fargo, N.D. Circular WL910. 16 pp.

Sidle, J.G. and P.M. Arnold. 1982. Notes on Duck Nest Structures. Prairie
     Naturalist, 14(2):59-60.

Stewart, R.E. 1975. Breeding Birds of North Dakota. TriCollege Center for 
     Environmental Studies. Fargo, N.D. 295 pp.