182 resultados para Pointers of fecal pollution
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"July 1992."
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At head of cover title: Illinois Environmental Protection Agency, Bureau of Land.
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"IEPA/WPC/84-004."-- Cover.
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A revision of vol. 5 of the 1979 plan.
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"February, 1981."
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Includes bibliographical references (p. 89-93).
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Bibliography: p. 89-93.