[1] C. International Conference on the Organization of Research and Training in Africa in relation to the Study and Association of African Geological Surveys, "L'Aide internationale: l'Association des services géologiques africains et la recherche concernant les ressources naturelles en Afrique ," 1964.

International Conference on the Organization of Research and Training in Africa in relation to the Study, Conservation and Utilization of Natural Resources, Lagos, 1964 and Association of African Geological Surveys, "L'Aide internationale: l'Association des services géologiques africains et la recherche concernant les ressources naturelles en Afrique ," 1964.

International Conference on the Organization of Research and Training in Africa in relation to the Study, C., Association of African Geological Surveys, (1964). "L'Aide internationale: l'Association des services géologiques africains et la recherche concernant les ressources naturelles en Afrique,"

International Conference on the Organization of Research and Training in Africa in relation to the Study, Conservation and Utilization of Natural Resources, Lagos, 1964, Association of African Geological Surveys. (1964). "L'Aide internationale: l'Association des services géologiques africains et la recherche concernant les ressources naturelles en Afrique,"