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Only IAS UDAAN (Quick & Comprehensive Revision Series) Environment & Ecology Pt-2021
Unacademy Environment & Ecology Critical Issues Mains- 2020
UPSC Focus (Environmental,Ecology & Biodiversity ,RAU’S IAS Magazine) PRELIMS COMPASS- 2020
NEW NCERT (Ecology & Environment) Study Material
Vajiram & Ravi Ecology & Environment (GS) Handwritten Class Notes -2019