Ilmavirta, V. Lakes and water management : proceedings of the 30 years jubilee symposium of the Finnish Limnological Socity, held in Helsinki, Finland, 22-23 September 1980 - Boston : Dr. W. Junk Publishers, 1982 - ix,222p. : ill. ; 27cm. Subjects--Topical Terms: Limnology Congresses, Water quality management LC Class. No.: QH96.A3L34