R. M. Singhal, S. P. Banerjee, and T. C. Pathak, “Effect of <I>Eucalyptus</I> Monoculture on the Status of Soil Organic Matter in Natural Sal (<I>Shorea Robusta</I>) Zone in Doon Valley”, Indian Forester, vol. 101, no. 12, pp. 730–737, Dec. 1975.