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	Nitrogen and Phosphorus in Water: An Annotated Selected Bibliography of Their Biological Effects Mackenthun, Kenneth M. Hardcover. Washington, D.C., U.S. Department of Health, Education, and Welfare, 1st, 1965, Book: Very Good, Dust Jacket: None, 111 pages. Fold-out Definitions and Equivalents page in back with measurements and acronyms. Very light foxing on top edge. Clean, tight copy. Record # 856404 Price:   $19.00