Search Results for the EPA National Library Catalog

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Select Item Title Year Published
Organism-substrate relationships in streams : a symposium held at the Pymatuning Laboratory of Ecology on July 16 and 17, 1964 / 1966
Studies on the aquatic ecology of the upper Ohio River system 1965
The ecology of algae : a symposium held at the Pymatuning Laboratory of Field Biology on June 18 and 19, 1959 / 1960

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