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. 



Department 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. 



15 



