मध्यप्रदेश की प्रमुख नदी नर्मदा के शुद्धिकरण हेतु प्रदूषण की रोकथाम का कार्य कब प्रारम्भ हुआ था ? - When was the work of prevention of pollution started for the purification of Narmada, the main river of Madhya Pradesh? - MadhyaPradesh Ki Pramukh Nadi Narmada Ke Sudhhikaran Hetu Pradooshann Ki Rokatham Ka Karya Kab Prarambh Hua Tha ? MP Gk in hindi, MPPSC Quiz November , 1986 question answers in hindi pdf January , 1987 questions in hindi, Know About January , 1985 MP Gk online test MP Gk notes in hindi quiz book November , 1988