6 1 10 Cox, B. Additional Author Aldon,E.F and Gonzales,C.E Additional Author mixed material Colorado Rocky Mountain Forest and Range Experiment Station 1987 Kenney, B.L. Additional Author Howarth,W.O and Warne,L.G.G. Additional Author mixed material London University Tutorial Press Ltd 1965 Underdahl, B. Additional Author Willett, E. Additional Author Pearson,N.L Additional Author mixed material Washington,D.C U.S. Department of Agriculture 1955 Tauber, D.A. Additional Author Kienan, B. Additional Author Holzschlag, M.E. Additional Author Porte,W.S Additional Author mixed material Washington,D.C US Department of Agriculture 1955 Response of Tung Trees Grown in Sand Culture to Potassium, Magnesium, Calcium, and Their Interactions (USDA) Chellis, J. Additional Author Perkins, C. Additional Author Strebe,M. Additional Author Sherar,G.B, Crane,H.L and Myers,A.T Additional Author mixed material Washington,D.C United State Department of Agricultue 1953 Simmons, P. Additional Author Hopkinson, A. Additional Author Schumacher,F.X and Chapman,R.A Additional Author mixed material North Carolina Duke University School Of Forestry 1948