Hootsmans, M. J. M. and J. E. Vermaat — Macrophytes, a key to understanding changes caused by eutrophication in shallow freshwater ecosystems.

Wageningen, the authors, 1991. 8vo. 412 pp.; numerous text figures and tabless. Pictorial softcover. = The authors's thesis (a rare case of two authors sharing one thesis). Deals with aquaric plants and other biological, chemical and physical factors influencing freshwater ecosystems. Two lists of "Stellingen" (propositions) loosely inserted. A very good, clean and unmarked copy. Very uncommon.