Dictionary of Entomology, Plant Pathology and Nematology O. P. Singh, S. K. Srivastava E-Book (epub)

Biotechnology (Novel Drug Delivery) Bhupinder Singh, O. P. Katare E-Book (epub)

Biodiversity And Ecology Of Aquatic Environments H. R. Singh, O. P. Nautiyal E-Book (epub)