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NCERT Compilation:
Click Here (Eco, Env, Science, History, Polity, Geo Almost All Compile)
NIOS Compilation:
Click Here (Environment)
Referance Book Compilation:
Click Here (Spectrum's Modern History, Majid Husain Geo, Sankar
IAS Env, Polity, Economy, Science all Major Exam point of view topic cover)
