Tap Water for all in rural India: Must-Read General Studies Booklist for UPSC IAS Prelims Must-Read General Studies Booklist for UPSC IAS Prelims in Hindi Must-Read General Studies Booklist for UPSC IAS Mains Must-Read General Studies Booklist for UPSC IAS Mains in Hindi The Vedic Age (1500 BC-600BC) The Vedic Age (1500 BC-600BC)– Hindi