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Anstey, D. A., S. K. Davis, D. C. Duncan, and M. Skeel.  1995. 
     Distribution and habitat requirements of eight grassland
     songbird species in southern Saskatchewan.  Saskatchewan
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Arnold, T. W., and K. F. Higgins.  1986.  Effects of shrub
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Bayha, K. D.  1964.  Project A-30: History of the Woodworth study
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Bent, A. C.  1968.  Life histories of North American cardinals,
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Berkey, G., R. Crawford, S. Galipeau, D. Johnson, D. Lambeth, and
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Best, L. B.  1975.  Interpretational errors in the "mapping
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Best, L. B., K. E. Freemark, J. J. Dinsmore, and M. Camp.  1995. 
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Bock, C. E., and J. H. Bock.  1987.  Avian habitat occupancy
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Bollinger, E. K., and T. A. Gavin.  1992.  Eastern bobolink
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Bowen, B. S., and A. D. Kruse.  1993.  Effects of grazing on
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Bragg, T. B.  1995.  Climate, soils and fire: the physical
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Bragg, T. B., and A. A. Steuter.  1995.  Mixed prairie of the
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Dale, B. C., P. A. Martin, and P. S. Taylor.  Effects of hay
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Davis, S. K., and D. C. Duncan.  1996.  Grassland songbird
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De Smet, K. D., and W. S. Miller.  1989.  Report on the status of
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Dobkin, D. S.  1992.  Neotropical migrant landbirds in the
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Eddleman, W. R.  1974.  The effects of burning and grazing on
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Ehrlich, P. R., D. S. Dobkin, and D. Wheye.  1988.  The birders
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Hall, G. A.  1964.  Breeding-bird censuses--Why and how.  Audubon
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Halvorsen, H. H., and R. K. Anderson.  1983.  Evaluation of
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Herkert, J. R.  1994.  Breeding bird communities of midwestern
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Higgins, K. F., L. M. Kirsch, and I. J. Ball, Jr.  1969.  A
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Higgins, K. F., L. M. Kirsch, A. T. Klett, and H. W. Miller. 
     1992.  Waterfowl production on the Woodworth station in
     south-central North Dakota, 1965-1981.  U.S. Fish and Wildl.
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Higgins, K. F., L. M. Kirsch, M. R. Ryan, and R. B. Renken. 
     1979.  Some ecological aspects of Marbled Godwits and
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Huber, G. E., and A. A. Steuter.  1984.  Vegetation profile and
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Johnson, D. H.  1996.  Studies of bird communities at the
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Johnson, D. H.  In press.  Management of northern prairies and
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Johnson, D. H., and M. D. Schwartz.  1993.  The Conservation
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Johnson, R. G., and S. A. Temple.  1986.  Assessing habitat
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     p. 245-249 In J. Verner, M. L. Morrison, and C. J. Ralph,
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Kahl, R. B., T. S. Baskett, J. A. Ellis, and J. N. Burroughs. 
     1985.  Characteristics of summer habitats of selected
     nongame birds in Missouri.  Res. Bull. 1056.  Univ.
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Kantrud, H. A.  1981.  Grazing intensity effects on the breeding
     avifauna of North Dakota native grasslands.  Can. Field-Nat.
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Kantrud, H. A., and K. F. Higgins.  1992.  Nest and nest site
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Knapton, R. W.  1994.  Clay-colored Sparrow (Spizella pallida). 
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Knopf, F. L. and J. A. Sedgwick.  1992.  An experimental study of
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Lanyon, W. E.  1994.  Western Meadowlark (Sturnella neglecta). 
     In The birds of North America, No. 104 (A. Poole and F.
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Lowther, P. E.  1993.  Brown-headed Cowbird (Molothrus ater).  In
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Peterjohn, B. G., and  J. R. Sauer.  1993.  North American
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Peterson, K. L., and L. B. Best.  1987.  Effects of prescribed
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Pylypec, B.  1991.  Impacts of fire on bird populations in a
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Rodenhouse, N. L. and L. B. Best.  1983.  Breeding ecology of
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Ryan, M. R., and R. B. Renken.  1987.  Habitat use by breeding
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Ryan, M. R., R. B. Renken, and J. J. Dinsmore.  1984.  Marbled
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Salt, W. R., and J. R. Salt.  1976.  The birds of Alberta. 
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Sample, D. W.  1989.  Grassland birds in southern Wisconsin:
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Schramm, P., D. S. Schramm, and S. G. Johnson.  1986.  Seasonal
     phenology and habitat selection of the Sedge Wren
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Sedgwick, J. A., and F. L. Knopf.  1992.  Describing Willow
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Skinner, R. M.  1982.  Vegetation structure and bird habitat
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Westenmeier, R. L., and J. E. Buhnerkempe.  1983.  Responses of
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