7 1 10 USDA Forest Service Additional Author Thomson, E.F. Additional Author Bahhady, F.A. Additional Author Marin, A. Additional Author mixed material Washington,D.C USDA Forest Service 1985 USDA Additional Author Thomson, E.F. Additional Author Thomson, F.S. Additional Author mixed material Colorado USDA Forest Service 1989 Keatinge, J.D.H. Additional Author Thomson, E.F. Additional Author B. Roidar Khan Additional Author A.Y. Allan Additional Author Tykac,J Additional Author mixed material England Hamlyn Publishers 1985 Shafiq,M.M Additional Author Thomson, E. Additional Author mixed material Pakistan Pakistan Forest Institute, Peshawar 2005 Thomson, E.F. Additional Author B. Roidar Khan Additional Author A.Y. Allan Additional Author Rodriguez, A.L. Additional Author Thomas,W.L Additional Author mixed material London The university of chicago press 1956 Troup R.S Additional Author Nordblom, T.L. Additional Author Thomson, E.F. Additional Author mixed material London Oxford At the Clarendon Press 1921 Thomson, E.F. Additional Author Cocks, P.S. Additional Author Somel, K. Additional Author El-Moneim, A.A. Additional Author Haig,I.T and Huberman,M.A Additional Author mixed material Rome FAO, of the United Nation 1957