The complete guide to water plants a reference book by Muhlberg, Helmut

Aquatic toxicology and hazard assessment proceedings of the ... Annual Symposium on Aquatic Toxicology.

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Aquatic toxicology and hazard assessment proceedings of the fourth Annual Symposium on Aquatic Toxicology held 16-17 Oct. 1979 in Chicago, Ill.

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Aquatic toxicology proceedings of the third annual symposium on aquatic toxicology

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Handbook of utilization of aquatic plants a view of world literature by Little, E. C. S.

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Handbook of utilization of aquatic plants a view of world literature