Tiwari, S.C. Concepts of modern ecology / by S.C. Tiwari - 2nd ed. - Dehradun: Bishen Singh Mahendrapal Singh, 2005. - xii, 663p. ISBN: 8121101395 Subjects--Topical Terms: EcologyEcosystemsEnvironmentLife science Dewey Class. No.: 577 / TIW/C