Rough, R.H. 1947. How to take a breeding bird census. Audobon 49:290-297. 



Preston, F.W. 1948. The commonness, and rarity, of species. Ecology 29:254-283. 



Preston, F.W. 1962. The canonical distribution of commonness and rarity: Part 1. 

 Ecology 43:185-215. 



Prodgers, R.A. 1978. Circle West vegetation baseline study. Montana Department 

 of Natural Resources and Conservation, Helena. 



Randall, R.N. 1975. Mixed prairie grassland. American Birds 29:1119. 



Robbins, C.S. 1970. Recommendations for an international standard for a mapping 

 method in bird census work. Audubon Field Notes 24:723-726. 



Robbins, C.S. , and W.T. Van Velzen. 1967. The breeding bird survey, 1966. U.S. 

 Fish and Wildlife Service, Bur. Sport Fish.Wildl., Spec. Sci . Rep. Wildl. 

 No. 102. Washington, D.C. 



Robbins, C.S. and W.T. Van Velzen. 1969. The breeding bird survey, 1967 and 1968. 

 U.S. Fish and Wildlife Service, Bur. Sport Fish, and Wild., Spec. Sci. Rep. 

 Wildl. No. 124. Washington, D.C. 



Ross, R.L., and H.E. Hunter. 1976. Climax vegetation of Montana. U.S.D.A. Soil 

 Conservation Service. 



Roth, R.R. 1976. Spatial heterogeneity and bird species diversity. Ecology 

 57:773-782. 



Rundquist, V.M. 1973. Avian ecology on stock ponds in two vegetational 



types in North-Central Montana. Phd. Thesis, Montana State University. 

 112 pp. 1973. 



Ruos, J.L. 1974. Mourning dove status report, 1973. U.S. D.I. Fish and Wildlife 

 Service Spec, Sci. Rep. Wildl. No. 186. 



Schroeder, M.H., and D.L. Sturges. 1975. The effect on the brewer's sparrow of 

 spraying big sagebrush. J. Range Manage. 28:284-297. 



Sharma, R.K. , J.D. Buffington, and J.T. McFadden (eds.) 1975. The biological 

 significance of environmental impacts. U.S. Nuclear Regulatory Commission, 

 Washington, D.C. 



Shaw, S.P., and C.G. Fredine. 1956. Wetlands of the United States. U.S. Fish 

 and Wildlife Service Circ. 39. 67 pp. 



Skaar, P.O. 1975. Montana bird distribution. P.D. Skaar, 501 S. Third, 

 Bozeman, MT. 



Slocomb, J., B. Stauffer, and K.L. Dickson. 1977. On fitting the truncated 

 lognormal distribution to species-abundance data using maximum likelihood 

 estimation. Ecology 58:693-696. 



Smith, R.H. 1953. A study of waterfowl production on artificial reservoirs in t 

 eastern Montana. J. Wildl. Manage. 17:276-291. 



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