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Anonymous. Snag and Den Tree Habitats for Wildlife. Wyoming Game and Fishing
     Department.

Baicich, P. and C. Harrison. 1997. Guide to Nests, Eggs, and Nestlings of North
     American Birds. Academic Press and Harcourt Brace. 347 pp.

Bookout, T.A., Editor. 1994. Research and Management Techniques for Wildlife
     and Habitats. Fifth ed. The Wildlife Society, Bethesda, MD. 740 pp.

Boon, B. and H. Groe. 1990. photograph. Nature's Heartland. Iowa State 
     University Press.

Bull, J. and J. Farrand, Jr. 1977. The Audubon Society Field Guide to North
     American Birds, Eastern Region. Alfred A. Knopf, New York. 784 pp.

Ehrlich, P.R., D.S. Dobkin, and D. Wheye. 1988 The Birder's Handbook: A Field
     Guide to the Natural History of North American Birds. Simon & Schuster
     Inc., New York. 785 pp.

Harrison, H.H. 1975. Birds' Nests. A Field Guide to the Birds' Nests - United
     States East of the Mississippi River. Houghton Mifflin Company, Boston. 
     New York. 257 pp.

Henderson, C.L. 1987. photograph. Landscaping for Wildlife. Minnesota
     Department of Natural Resources.

Maslowski Wildlife Productions. photograph. Arkansas Wildlife. Ed. Keith
     Sutton. Winter 1997-98.

North American Bluebird Society. 1999. Eastern Bluebird Nest Box, in 
     www.cobleskill.edu/nabs/eastbox.htm

Patterson, R.M. 1981. Protecting nesting boxes from climbing predators.
     Sialia. 3:133-135.

Peterson, R.T. 1980. Eastern Birds. Fourth ed. Houghton Mifflin Company, 
     Boston. 384 pp.

Pinkonski, B.C. 1977. Foraging behavior of the eastern bluebird. Wilson
     Bulletin. 89:404-414.

Robbins, C.S., B. Bruun, and H.S. Zim. 1983. Birds of North America. Western
     Publishing Company, Inc., Racine, Wisconsin. 360 pp.

Sauer, J.R., J.E. Hines, G. Gough, I. Thomas, and B.G. Peterjohn. 1997. The
     North American Breeding Bird

Survey Results and Analysis. Version 96.4. Patuxent Wildlife Research Center,
     Laurel, Maryland.

Sauer, J.R., S. Schwartz, and B. Hoover. 1996. The Christmas Bird Count Home
     Page. Version 95. 1. Patuxent Wildlife Research Center, Laurel, Maryland.

Solem, J.K. 1994. Orientation and Spacing of Nesting Boxes Used by Eastern 
     Bluebirds and Tree Swallows. Sialia. 16:127-129.

Stokes, D. and L. Stokes. 1989. A Guide to Bird Behavior, Volume III. Little,
     Brown, and Company. Boston, Massachusetts. 397 pp.

Terres, J.K. 1991. The Audubon Society Encyclopedia of North American Birds.
     Wings Books, New York. 1110 pp.

Zeleny, L. 1976. The Bluebird. Indiana University Press, Bloomington, Indiana.
     170 pp.