574.52632
F7                A Manual on methods for the assessment of secondary productivity in freshwater / edited by John A. Downing and Frank H. Rigler . - 2nd ed. . - London : Balckwell Scientific Publications,1984 . - xix.,501p.; . - IBP handbook no.17 .

               includes bibliographical references & index

               0-632-00616-1

Central Inland Fisheries Research Institute

CIFRI