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F. T. Portlock

Stand Alone

Forest tree seed inspectors' manual : OECD scheme for certification of forest reproductive material moving in international trade =: Guide de l'inspecteur des semences d'arbres forestiers : certification du matériel forestier de reproduction destiné au commerce international conformément au système de l'OCDE
A Field Guide to Collecting Cones of British Columbia Conifers
List of Approved Basic Material for Canada Under the OECD Forest Tree Seed Certification Scheme, 1970-1995
Forest tree seed certification in Canada under the OECD scheme and ISTA rules: summary for 1991-1995
Forest Tree Seed Certification in Canada Under the OECD Scheme and ISTA Rules : Summary Report for 1986-1990