Categories

• Physics,History
• Environmental Studies
• Computer Science
• Physics
• Others,Botany
• Others,Physics
• enviromental studies
• economy
• Economic
• Other

Authors

• Due
• w.t.
• Gurukkal R.
• Smith,Ehrenbeng
• Kotpal,R.L
• Gravellel , Rees
• B.,Chakravarti
• Gupta, d.c.,Srivastava, l.n.
• Vanshney ,Gupta, A.N
• PradhanH.K,Agrawal,Jain , Tadin