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  1. 1
    Primary productivity by phytoplankton in the tidal, fresh Potomac River, Maryland, May 1980 to August 1981

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

    Reston, Va. : Denver, Colo. :; Reston, Va. : U.S. Dept. of the Interior, Geological Survey ; U.S. Geological Survey, Open-File Services Section, Western Distribution Branch [distributor],; U.S. Geological Survey, 1983
    Format: Government Document Book


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  2. 2
    Phytoplankton dynamics of the fresh, tidal Potomac River, Maryland, for the summers of 1979 to 1981 : a water-quality study of the tidal Potomac River and estuary

    Phytoplankton dynamics of the fresh, tidal Potomac River, Maryland, for the summers of 1979 to 1981 : a water-quality study of the tidal Potomac River and estuary by Cohen, Ronald R. H.

    [Reston, Va.?] : Denver, Colo. : Dept. of the Interior, U.S. Geological Survey ; For sale by the Books and Open-File Reports Section, 1988
    Format: Government Document Book


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