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|Material Type:||Government publication, National government publication|
|All Authors / Contributors:||
R W Davis; Edward W Matthews; United States. Environmental Protection Agency.
|Description:||iv, 25 pages : illustrations ; 28 cm.|
|Series Title:||U.S. Geological Survey water-supply paper, 2202.|
|Responsibility:||by R.W. Davis and Edward W. Matthews ; prepared in cooperation with the U.S. Environmental Protection Agency.|