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Godfrey, A.E., 1977, A physiographic approach to land use planning:  
    Environmental Geology, v. 2, p. 43-50.  

Hamilton, Karen, and Bergersen, E.P., 1984, Methods to estimate aquatic 
    habitat variables:  Denver, Colo., U.S. Bureau of Reclamation, 
    Environmental Evaluation Project Report Number DPTS-35-9.
  

Hawkins, C.P., 1985, Substrate associations and longitudinal distributions 
    in species of Ephemerellidae (Ephemeroptera: Insecta) from western 
    Oregon:  Freshwater Invertebrate Biology, v. 4, p. 181-188.  

Hirsch, R.M., Alley, W.M., and Wilber, W.G., 1988, Concepts for a National 
    Water-Quality Assessment Program:  U.S. Geological Survey Circular 1021, 
    42 p.  

Horton, R.E., 1945, Erosional development of streams and their drainage 
    basins:  Hydrophysical approach to quantitative morphology:  
    Bulletin of the Geological Society of America, v. 56, p. 275-370. 

Hupp, C.R., 1986, Upstream variation in bottomland vegetation
    patterns, northwestern Virginia:  Bulletin of the Torrey Botanical Club,
    v. 113, p. 421-430.  

Hupp, C.R., and Osterkamp, W.R., 1985, Bottomland vegetation distribution 
    along Passage Creek, Virginia, in relation to fluvial landforms:  
    Ecology, v. 66, p. 670-681.  

Hynes, H.B.N., 1975, The stream and its valley:  Verhandlungen Internationale 
    Vereinigung fur Theoretische und Angewandte Limnologie, v. 19, 
    p. 1-15.  

King, P.B., and Beikman, H.M., 1974, Explanatory text to accompany the 
    geologicmap of the United States:  U.S. Geological Survey Professional 
    Paper 901, 40 p.  

Klingeman, P.C., and MacArthur, R.C., 1990, Sediment transport and aquatic 
    habitat in gravel-bed rivers, in Chang, H.H., and Hill, J.C., eds., 
    Hydraulic Engineering:  New York, American Society of Civil Engineers, 
    p. 1116-1121. 

Kuchler, A.W., 1970, Potential natural vegetation, in The national atlas of 
    the United States of America, U.S. Geological Survey, p. 89-91.   

Leahy, P.P., Rosenshein, J.S., and Knopman, D.S., 1990, Implementation plan 
    for the National Water-Quality Assessment Program:  U.S. Geological 
    Survey Open-File Report 90-174, 10 p.  

Leopold, L.B., and Wolman, M.G., 1957, River channel patterns:  Braided, 
    meandering, and straight:  U.S. Geological Survey Professional Paper 
    282-B, p. 39-85. 

Leopold, L.B., Wolman, M.G., and Miller, J.P., 1964, Fluvial processes in 
    geomorphology:  San Francisco, W.H. Freeman, 522 p.  

Lotspeich, F.B., and Platts, W.S., 1982, An integrated land-aquatic 
    classification system:  North American Journal of Fisheries Management, 
    v. 2, p. 138-149.