Categories

• psycholigy
• English
• Biology
• geography
• Logic
• Physics
• englisg
• Chemistry
• Physics,History
• Others,Physics

Authors

• Singer Peter
• m.n.
• Garett
• Swain , S.K.
• porter, t.e.,Shakespeare, W.
• R.,millar,R.,millar
• Baird
• Mukharjee, Ghosh
• sanapati and debi
• Agrawal, S.,Das , K.M.