Categories

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• Physics,History
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Authors

• Pahuja O.P.
• reeves
• Bhandari D.R
• Beckor
• P.,nandy,P.,nandy
• M.C,Seth
• Sathpathi N.N
• Yamane, Taro,Datt , Sundaram
• Prasad B,Francis H
• mathur p.s.