■ Yaounde deadline: May 31 is the date of expiry of the Yaounde convention associating 18 African states (14 former French colonies, three former Belgian colonies and Somalia) ■ Personalities and Politics in Ghana-2: If as I suggested in my first article, Dr Busia's new Progress Party has certain clear links with the old opposition to Dr. Nkrumah ■ Books and publications: Peasants in the Guinea war: The liberation of Guinea aspects of an African revolution by Basil Davidson forwarded by Amilcar Cabral ■ Commercial news: CDC: profit and loss in West Africa: Cameroon wants the Commonwealth development corporation to continue as managing agents for the Cameroons development corporation after December 1969 ■ Commercial news: Japan buys Nigerian oil: For the first time, a Japanese oil concern, Idemitsu Kosan Kaisha has bought oil from Africa ■ Dateline Africa: Ivory Coast: Abidjan university closed down: The university of Abidjan and the schools attached to it have been closed until the reform of the higher education system ■ Dateline Africa: Nigeria: Biafra air raids start again: Night aircraft in the service of the Biafrans raided Port Harcourt airport on May 22 and Benin airport on May 24 at Port Harcourt at least one piston- engined aircraft