Categories

• Logic
• Others,Botany
• Environmental Studies
• Economic
• Economics,History
• geography
• Others,Physics
• Zoology
• Botany,Physics
• economy

Authors

• Khan, M.Q,Achaya S
• Dash,Nibedita
• Gandmer
• Das , M.
• Raghabam
• watt lan
• bal
• Patri ,D.N.
• Nanda H.P.
• W.,baker