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Meador, M.R., Cuffney, T.F., and Gurtz, M.E., 1993, Methods for sampling fish
    communities as part of the National Water-Quality Assessment Program: 
    U.S. Geological Survey Open-File Report 93-104, 40 p. 

Mueller-Dombois, Dieter, and Ellenberg, Heinz, 1974, Aims and methods of 
    vegetation ecology:  New York, John Wiley and Sons, 547 p.  

Ohio Environmental Protection Agency, 1989, Biological criteria for the 
    protection of aquatic life:  Volume III.  Standardized biological field 
    sampling and laboratory methods for assessing fish and invertebrate 
    communities:  Columbus, Ohio Environmental Protection Agency, 58 p.  

Omernik, J.M., 1987, Ecoregions of the conterminous United States:  Annals of 
    the Association of American Geographers, v. 77, p. 118-125. 

Orth, D.J., 1982, Aquatic habitat measurements, in Nielsen, L.A., and Johnson, 
    D.L., eds., Fisheries Techniques:  Bethesda, Md., American Fisheries 
    Society, p. 61-84.  

Osborne, L.L., Dickson, B., Ebbers, M., Ford, R., Lyons, J., Kline, D., 
    Rankin, E., Ross, D., Sauer, R., Seelbach, P., Speas, C., Stefanavage, T., 
    Waite, J., and Walker, S., 1991, Stream habitat assessment programs in 
    states of the American Fishe ries Society North Central Division:  
    Fisheries, v. 16, p. 28-35.   

Osborne, L.L., and Wiley, M.J., 1992, Influence of tributary spatial position 
    on the structure of warmwater fish communities:  Canadian Journal of 
    Fisheries and Aquatic Sciences, v. 49, p. 671-681.  

Platts, W.S., Megahan, W.F., and Minshall, G.W., 1983, Methods for evaluating 
    stream, riparian, and biotic conditions:  Ogden, Utah, U.S. Forest 
    Service, General Technical Report No. INT-138, 70 p.  

Platts, W.S.; Armour, Carl; Booth, G.D.; Bryant, Mason; Bufford, J.L.; 
    Cuplin, Paul; Jensen, Sherman; Lienkaemper, G.W.; Minshall, G.W.; Monsen, 
    S.B.; Nelson, R.L.; Sedell, J.R.; and Tuhy, J.S., 1987, Methods for 
    evaluating riparian habitats with applications to management:  Ogden, 
    Utah, U.S. Forest Service, General Technical Report INT-221, 177 p.  

Porter, S.G., Cuffney, T.F., Gurtz, M.E., and Meador, M.R., 1993, Methods for 
    collecting algal samples as part of the National Water-Quality Assessment 
    Program:  U.S. Geological Survey Open-File Report 93-409, 39 p. 

Quinn, J.M., and Hickey, C.W., 1990, Characterisation and classification of 
    benthic invertebrate communities in 88 New Zealand rivers in relation to 
    environmental factors:  New Zealand Journal of Marine and Freshwater 
    Research, v. 24, p. 387-409.  

Schumm, S.A., 1963, Sinuosity of alluvial channels on the Great Plains:  
    Geological Society of America Bulletin, v. 74, p. 1089-1100.  

Schumm, S.A., and Lichty, R.W., 1965, Time, space, and causality in 
    geomorphology:  American Journal of Science, v. 263, p. 110-119.