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Cocoa
Urquhart, D. H., (1955)
Hall, Constant Johan Jacob van, (1914)
(1956)
Urquhart, Duncan Hector, (1955)
Coffee growing in New Caledonia : a report on a survey made for the South Pacific Commission from 5th to 17th March, 1952
Urquhart, Duncan Hector, (1953)