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Primary productivity by phytoplankton in the tidal, fresh Potomac River, Maryland, May 1980 to August 1981 /
by Ronald R.H. Cohen and Sheryl O. Pollock.

APA Citation

Cohen, R. R. H., Pollock, S. O., Geological Survey (U.S.). (1983). Primary productivity by phytoplankton in the tidal, fresh Potomac River, Maryland, May 1980 to August 1981. Reston, Va.: U.S. Geological Survey.

MLA Citation

Cohen, Ronald R. H, Sheryl O Pollock, and Geological Survey (U.S.). Primary Productivity by Phytoplankton In the Tidal, Fresh Potomac River, Maryland, May 1980 to August 1981. Reston, Va.: U.S. Geological Survey, 1983.

Warning: These citations may not always be complete (especially for serials).