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M. Holderness, Project Proposal – Phyophthora Palmivora infection of cocoa roots, Cocoa Board of Papua New Guinea, Aug 1986
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Brief for the Minister on the Cocoa Board and the Cocoa Industry in Papua New Guinea, Rabaul, Cocoa Board of PNG, Jul 1988
Brief for the Minister fotr Agriculture and Livestock, Honourable Roy Evara, on the present state of the cocoa industry, Rabaul, Cocoa Board of PNG, 28 Jul 1992