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1
Washington, DC : APHA, 1985
16th ed.

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2
by Carmichael, Wayne W.
Denver, CO : AWWA Research Foundation and American Water Works Association, 2001

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3
Washington, DC : American Public Health Association, 1989
17th ed.

Book
4
Washington, DC : American Public Health Association, 1998
20th ed.

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5
New York : M. Dekker, 1981

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6
Washington, DC : American Public Health Association, 2005
21st ed. 2005, Centennial ed. /

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7
by Phelps, Earle B. (Earle Bernard), 1876-1953
New York, J. Wiley and Sons, Inc.; London, Chapman and Hall, Limited 1944

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