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Ballard, Russel ,  [I.U.F.R.O. Symposium on forest site and continous productivity, Seattle, Washington, August 22-28, 1982] ,  I.U.F.R.O. Symposium on forest site and continous productivity, Seattle, Washington, August 22-28, 1982

Cochran, P.H. ,  [Thermal properties and surface temperatures of seedbeds: a guide for foresters] ,  Thermal properties and surface temperatures of seedbeds: a guide for foresters