Abstract
Phosphorus is undoubtedly the major plant nutrient controlling phytoplankton growth in the upper Great Lakes and the nutrient responsible for accelerated eutrophication in the lower Great Lakes. No studies published before 1970 provide conclusive evidence of the specific roles of phosphorus and other nutrients as growth limiting factors for phytoplankton. Improper citation of references can inadvertently cast doubt on the key role of phosphorus, or denigrate uncited work, depending on the reader's background. Key words: phosphorus, nitrogen, eutrophication, phytoplankton, limiting nutrients, Lake Michigan, Lake Superior, Lake Huron

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