Search Results for the EPA National Library Catalog

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Your Search: (SUBJECT=Spirodela)

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Select Item	Title	Year Published
1	Environmental Control of Nitrogen Fixation in Lakes: I. In situ Nitrogen Fixation by Free Living Blue-Green Algae. II. Nitrogen Fixation by the Duck-Weed-Algal Association.	1974
2	Factors affecting the uptake of iron in Spirodela oligorhiza (Kurtz) Hegelm /	1961
3	Water quality renovation of animal waste lagoons utilizing aquatic plants /	1978

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