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American Public Health Association. 1985. Standard methods for examination 
     of water and wastewater. Sixteenth edition. American Public Health 
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Bell, J. F., G. W. Sciple, and A. A. Hubert. 1955. A microenvironment 
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Cooley, W. W., and P. R. Lohnes. 1971. Multivariate data analysis. John Wiley 
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Dixon, W. J., M. B. Brown, L. Engelman, M. A. Hill, R. I. Jennrich.  1988. BMDP 
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Morrison, D. F. 1976. Multivariate statistical methods.  McGraw-Hill, New York,
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Pennak, R. W. 1978. Fresh-water invertebrates of the United States. Second 
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Rocke, T. E., and C. J. Brand. 1994. Use of sentinel mallards for epizootiologic
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Usinger, R. L. 1956. Aquatic insects of California. University of California Press,
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Watanabe, I., and C. Furusaka. 1980. Microbial ecology of flooded rice soils. Pages
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