Smith, G.M. 1950. the Fresh-Water Algae of The United States. 

 McGraw-Hill Book Company, New York. 



Stevenson, R.J., and L.L. Bahls. 1999. Periphyton Protocols. 

 Chapter 6 in Barbour, M.T., J. Gerritsen, B.D. Snyder, and 

 J.B. Stribling. Rapid Bioassessment Protocols for Use in 

 Streams and Wadeable Rivers: Periphyton, Benthic 

 Macroinvertebrates and Fish. Second Edition. EPA/841-B-99- 

 002. U.S. EPA, Office of Water, Washington, D.C. 



Stevenson, R.J., and Y. Pan. 1999. Assessing Environmental 



Conditions in Rivers and Streams with Diatoms. Chapter 2 in 

 Stoermer, E . F . , and J. P. Smol (eds.). The Diatoms: 

 Applications for the Environmental and Earth Sciences. 

 Cambridge University Press, New York. 



USDA. 1976. Climax Vegetation of Montana (map). U. S. 



Deptiiiment of Agriculture, Soil Conservation Service, 

 Cartographic Unit, Portland. 



Whitford, L.A., and G.J. Schumacher. 1984. A Manual of Fresh- 

 Water Algae (Revised) . Sparks Press, Raleigh, North 

 Carolina. 



Whittaker, R.H. 1952. A study of summer foliage insect 



communities in the Great Smoky Mountains. Ecological 

 Monographs 22:1-44. 



Woods, A.J., Omernik, J.M., Nesser, J. A., Shelden, J., and 



Azevedo, S.H. 1999. Ecoregions of Montana (color poster 

 with map), U.S. Geological Survey, Reston, Virginia. 



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