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(1) Booth, R. L., J. N. English, and G. N. Mc- 

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(2) Breidenbach, a. W., et al. 1966. The identifica- 

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(5) Ettinger, M. B. 1960. A proposed toxicological 

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(4) Gales, M. F., Jr., E. C. Julian, and R. C. Kroner. 

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(5) Geldreich, E. E. 1966. Sanitary significance of 

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(7) KoENiG, L. 1967. The cost of water treatment by 

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(5) MiDDLETON, F. M., A. A. Rosen, and R. H. 

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