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574.52632
D748                A Manual on methods for the asessment of secondary productivity in fresh waters / edited by John A. Downing and Frank H. Rigler . - 2nd ed. . - Oxford : Blackwell Scientific Publications,1984 . - xxiv,501p.; fig. . - IBP handbook series no.17 .

               Includes bibliography & index

               ISBN: 0-632-00616-1