LITERATURE CITED 



Albertson, F. and J. Weaver. 1944. Effects of drought, dust and intensity of 

 grazing on cover and yield. Ecological Monographs. 14(1): 3-29. 



Allred, B. W. 1941. Grasshoppers and their effect on sagebrush on the Little 

 Powder River in Wyoming and Montana. Ecology. 22: 387-392. 



Anderson, D. J. 1965. Classification and ordination in vegetation science: con- 

 troversy over a non-existent problem? Journal of Ecology. 53(2): 521-526. 



Anderson, N.L. 1961. Seasonal losses in rangeland vegetation due to grass- 

 hoppers. Journal of Economic Entomology. 54(2): 369-378. 



, 1964. Some relationships between grasshoppers and vegetation. Annals 



of Entomology Society of America. 57: 736-742. 



Arnold, J. F. 1955. Plant life-form classification and its use in evaluating 

 range condition and trend. Journal of Range Management. 8: 175-181. 



Ayensu, E. and R. De Fillipa. 1978. Endangered and threatened plants of the 

 United States. Smithsonian Institute. 403 pp. 



Bannister, P. 1966. The use of subjective estimates of cover-abundance as the 

 basis for ordination. Journal of Ecology. 54: 665-674. 



Beals, E. 1960. Forest bird communities in the Apostle Islands of Wisconsin. 

 Wilson Bulletin. 72: 156-181. 



Bonham, C. 1974. Classifying grassland vegetation with a diversity index. 

 Journal of Range Management. 27(3): 240-243. 



Booth, W.E. 1972. Grasses of Montana. Montana State University. Department 

 of Botany and Microbiology. Bozeman, Montana. 



_, and J. C. Wright 1959 (Revised 1966). Flora of Montana part II: 



dicotyledians. Revised. Montana State University. Bozeman, Montana. 



Branson, F., R. Miller and I. McQueen. 1970. Plant communities and associated 

 soil and water factors on shale derived soils in northeastern Montana. 

 Ecology. 51(3): 391-407. 



Bray, J.R. and J. T. Curtis. 1957. An ordination of the upland forest com- 

 munities of southern Wisconsin. Ecological Monographs 27(4): 325-349. 



Brown, J.K. 1976. Estimating shrub biomass from basal stem diameters. Can- 

 adian Journal of Forestry Resources. 6(2): 153-158. 



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