Tiwari, Vijay Kumar. A textbook of environmental studies / by Vijay Kumar Tiwari - 1st ed. - Mumbai: Himalaya Publishing House, 2014. - 432p. ISBN: 9788184886405 Subjects--Topical Terms: Child welfareEconomicsEcosystemsNatural resources Dewey Class. No.: 333.7 / TIW/A