Hill, Polly
The gold coart cocoa farmer : a premilinary survey Polly Hill
London Oxford University Press 1956,
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Information literacy and student engagement: what the national survey of student engagement reveals about your campus Amy E.Mark,Polly D.Borulf-Jones
 Artikel Jurnal
Gold, Joseph
SDRs, currencies, and gold : sixth survey of the new legal developments / Joseph Gold
International Monetary Fund , 1983
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Galletti, R.
Nigerian cocoa farmers : an economic survey of Yoruba cocoa farming families / by R. Galletti, K. D. S. Baldwin, and I. O. Dina
Oxford University Press, 1956
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Heijbroek, A.M.A., author
The cocoa and chocolate market
Rabobank International Group, 1995
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