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"June 2000."Includes bibliographical references (p. 41-42).Mode of access: Internet
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"June 2000."Includes bibliographical references (p. 41-42).Mode of access: Internet
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"October 1987."Shipping list no.: 88-13-P.Bibliography: p. 48-51.Mode of access: Internet
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Shipping list no.: 2001-0015-P."National Water-Quality Assessment Program."Includes bibliographical ...
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