Categories

• Economics
• History
• Zoology
• Education
• IT
• Logic
• Botany
• enviromental studies
• geography
• Political Science,Zoology

Authors

• Nahak,G.R
• W.J,Baumol
• V.C
• D.W
• Chakrakanti P.K
• Delong
• Sathpathi H.K
• Das , Patnaik,Das , Satpathy
• Sharma .N
• Sen, k., S., Chopra, p.s. and kothari