United States. Department of Health, Education, and Welfare. (1932). Study of pollution and natural purification of upper Mississippi River: Surveys and laboratory studies. GPO.
Chicago Style (17th ed.) CitationUnited States. Department of Health, Education, and Welfare. Study of Pollution and Natural Purification of Upper Mississippi River: Surveys and Laboratory Studies. [Washington]: GPO, 1932.
MLA (9th ed.) CitationUnited States. Department of Health, Education, and Welfare. Study of Pollution and Natural Purification of Upper Mississippi River: Surveys and Laboratory Studies. GPO, 1932.
Warning: These citations may not always be 100% accurate.