U.S. Department of Agriculture, Department of Natural Resources and Conservation. 

 1977. Average annual precipitation of Montana. Water resources division, 

 Helena, Montana. 



Van Bruggen. 1975. The vascular plants of South Dakota. Iowa State Union 

 Press. 538 pp. 



Wakeland, C. 1961. The replacement of one grasshopper species by another. 

 U.S. Department of Agriculture Produce Research Report No. 42. 9 pp. 



Webb, D.A. 1954. Is the classification of plant communities either possible 

 or desirable? Bat. Tidskr. 51:362-370. 



Weaver, J.E. and F.W. Albertson, 1956. Grasslands of the great plains. 

 Johsen Publishing Co. 395 pp. 



West, N. 1966. Matrix cluster analysis of montane forest vegetation of the 

 Oregon Cascades. Ecology. 47:975-980. 



White, E.M. 1961. A possible relationship of the little bluestem ( Andropogon 

 scoparius ) distribution to soils. Journal of Range Management. 14:5. 



Whitman, W. 1975. Grasslands of North Dakota. In Prairie: a multiple view. 

 M. Wali (ed). University of North Dakota Press, Grand Forks. 



, and H. Hanson. 1939. Vegetation of scoria and clay buttes in 



western North Dakota. Ecology. 20:455-457. 



, and C. Haugse. 1972. Effects of added rainfall on range vegetation 



production. Unpublished. 



Whittaker, R. 1956. Vegetation of the Great Smoky Mountains. Ecological 

 Monogoraphs. 26:1-80. 



, 1967. Grodient analysis of vegetation. Biological Review. 



42:207-264. 



Whittaker, R.H. 1975. Communities and ecosystems. McMillan Publishing Co. 

 , New York. 385 pp. 



, 1962. Classification of natural communities. Botanical Review 



28:1-239. 



Whittaker, R. and W. Niering. 1965. Vegetation of the Santa Catalina Mount- 

 ains, Arizona. A gradient analysis of the south slope. Ecology 46: 

 429-452. 



Williams, W.T., and M.B. Dale. 1965. Fundamental problems in numerical 

 taxonomy. Botanical Review. 2:35-68. 



Williams, W. , Lambert, J., and G. Lance. 1966. Multivariate methods in plant 

 ecology. Journal of Ecology. 54:427-445. 



Wright, J.C. and E. A. Wright. 1948. Grassland types of south central Montana. 

 Ecology 29 (4):449-460. 



88 



