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ref. 472385 — Oxford University Press. Hardcover. Fair. A comprehensive history of Nigeria has yet to be written but in this introduction to the subject Dr. Dike has made an important contribution to the study of one of the country's principal formative periods by drawing on local as well as British sources for his material. From the sixteenth century the Niger Delta had been the main centre of African trade Europeans in the Gulf of Guinea; by 1830 when the trade in palm oil had largely displaced the trade in men it was exporting more oil than the rest of West Africa put together. The area grew in commercial importance from 1832 and a succession of British expeditions used the Delta and Niger valley as their main highway to the Nigerian hinterl Oxford University Press hardcover