Ruttner, Franz, 1882-1961. Fundamentals of limnology. [electronic resource] / Translated by D. G. Frey and F. E. J. Fry.. — 3d ed.. — [Toronto] : University of Toronto Press,, 1963.. — xvi, 295 p. : illus., diagrs. 24 cm. Bibliography: p. [262]-279. LCCN: 64000919 //r83 Subjects--Topical Terms: Limnology. LC Class. No.: QH96 / .R813 1963 Dewey Class. No.: 551.48