Davies, D. G. (1967). Fresh water: The precious resource. Natural Press for the American Museum of Natural History.
Chicago-viite (17. p.)Davies, Delwyn G. Fresh Water: The Precious Resource. GArden City, N. Y: Natural Press for the American Museum of Natural History, 1967.
MLA-viite (9. p.)Davies, Delwyn G. Fresh Water: The Precious Resource. Natural Press for the American Museum of Natural History, 1967.
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