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- [2] FROM SLAVE TRADE TO COLONIAL TRADE - ECONOMIC AREAS AND ECONOMIC FORMS IN CAMEROON BEFORE 1914 - GERMAN - WIRZ,A AFRICA, 1974, 44 (03): : 309 - 310
- [4] FROM SLAVE-TRADE TO COLONIAL TRADE - ECONOMIC SPACES AND ECONOMIC FORMS IN CAMEROUN BEFORE 1914 - GERMAN - WIRZ,A HOMME, 1974, 14 (01): : 101 - 101
- [5] FROM SLAVE-TRADE TO COLONIAL TRADE - ECONOMIC AREAS AND ECONOMIC FORMS IN CAMEROON BEFORE 1914 - GERMAN - WIRZ,A CANADIAN JOURNAL OF AFRICAN STUDIES-REVUE CANADIENNE DES ETUDES AFRICAINES, 1978, 12 (03): : 491 - 494
- [6] FROM SLAVE-TRADE TO COLONIAL TRADE, ECONOMIC REGIONS AND ECONOMIC FORMS IN CAMEROON BEFORE 1914 - GERMAN - WIRZ,A REVUE BELGE DE PHILOLOGIE ET D HISTOIRE, 1975, 53 (04): : 1367 - 1368
- [7] FROM SLAVE TRADE TO COLONIAL TRADE - ECONOMIC SPACES AND FORMS IN CAMEROONS BEFORE 1914 - GERMAN - WIRZ,A INTERNATIONAL JOURNAL OF AFRICAN HISTORICAL STUDIES, 1975, 7 (03): : 543 - 545
- [9] SHIPPING, MARITIME TRADE AND ECONOMIC DEVELOPMENT OF COLONIAL NORTH AMERICA - SHEPHERD,JF AND WALTON,GM CANADIAN HISTORICAL REVIEW, 1974, 55 (03): : 342 - 343