00639nam a22002177a 4500 0 0 0 0 RIEBR RIEBR GEN 2020-06-03 40.00 0 577 VER-PR G16457 2020-06-03 2020-06-03 BK 72023 72023 20200624125646.0 200603b ||||| |||| 00| 0 eng d eng 577 VER-PR Verma, P.S. 19778 880 Principles of ecology = environmental biology/ by P.S. Verma and V.K. Agarwal 4th ed. New Delhi: S. Chand, 1989. vii, 591p.; 21cm. [Includes glossary, bibliographies and index] Ecology 1407 Environmental aspects 19167 Agarwall, V.K. 19168 245 BK