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Scott Yarbo & Eric Omuru (Economics Division), Papua New Guinea Cocoa Market Report April – June 1993, Rabaul, Cocoa Board of PNG, bound with Special Feature, Alistair McGregor, Seedling blight in cocoa, PNG Cocoa & Coconut Research Institute, CCRI Information Bulletin No.3, Sep 1991.
Scott Yarbo & Eric Omuru (Economics Division), Papua New Guinea Cocoa Market Report October – December 1992, Rabaul, Cocoa Board of PNG, bound with Special Feature, J.J. Dennis, G-Y Tan & C. Prior, Vascular-streak dieback disease of cocoa, Rabaul, PNG Cocoa & Coconut Research Institute and Cocoa Quality Improvement Project, CCRI Information Bulletin No.1, Nov 1991.
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