भारतीय वैज्ञानिकों के नाम तथा उनका विज्ञान के क्षेत्र में योगदान
प्रमुख विदेशी वैज्ञानिकों के नाम तथा उनका विज्ञान के क्षेत्र में योगदान
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My name is Ashwani kumar gupta villege Vijaypur
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