John Perkins and Trevor Clarke, Narapela pasin long ronim bisnis kakau insait long Papua Niugini, Rabaul, Aug 1980 with An Alternative Cocoa Policy for Papua New Guinea Adicionar à área de transferência AU PMB DOC 538-75 Item Aug 1980 Parte de Papua New Guinea Cocoa Board Publications Perkins, John and Clarke, Trevor
John Perkins and Trevor Clarke, An Alternative Policy for Cocoa in Papua New Guinea: a discussion paper, Rabaul, Aug 1980 Adicionar à área de transferência AU PMB DOC 538-74 Item Aug 1980 Parte de Papua New Guinea Cocoa Board Publications Perkins, John and Clarke, Trevor