Keighton, W. (1965). Delaware River Water Quality, Bristol to Marcus Hook, Pennsylvania, August 1949 to December 1963. U.S. Gov. Print. Office.
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Chicago Style (17th ed.) Zitazioa
Keighton, W.B. Delaware River Water Quality, Bristol to Marcus Hook, Pennsylvania, August 1949 to December 1963. Washington: U.S. Gov. Print. Office, 1965.
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MLA (9th ed.) Zitazioa
Keighton, W.B. Delaware River Water Quality, Bristol to Marcus Hook, Pennsylvania, August 1949 to December 1963. U.S. Gov. Print. Office, 1965.
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