8 1 10 Gregersen, H.M. Primary Author mixed material 9781845937 Cmbridge CABI Publishing 2007 Gregersen, H.M. Additional Author Lundgren, A.L. Additional Author Bengston, D.N. Additional Author Collingwood,G,G and Brush,W,D Additional Author mixed material Washington,D.C The American Forestry Association 1947 Frevert,R.K, Schwab,G.O, Edminster,T.W and Barnes,K.K Additional Author Gregersen, H. Additional Author mixed material New York John Wiley & Sons 1955 Gregersen, H.M. Additional Author Shepard,F.P Additional Author Contreras, A.H. Additional Author mixed material New York Harper & Row, Publishers 1973 Gregersen, H. Additional Author Oram, P. Additional Author Stoddart,L.A, Smith,A.D and Box,T.W Additional Author Spears, J. Additional Author mixed material New York McGraw- Hill Book Company 1975 Hamilton, L.S. Additional Author Gregersen, H.M. Additional Author Brooks, K.N. Additional Author Dixon, J.A. Additional Author Woodger,J.H Additional Author mixed material London Oxford University Press 1947 guidelines for managers. (FAO paper 96) Gregersen, H.M, Lundgren, A.L and Bengston, D.N. Additional Author mixed material Rome FAO, of the United Nation 1990 Gregersen, H. Additional Author Smith,G.M. Additional Author mixed material New York McGraw- Hill Book Company 1972