sponsored by the Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville ; edited by Dennis G. Watson, Fedro S. Zazueta, A.B. (Del) Bottcher
organized by Faculty of Agriculture and Forestry with support of Prime Minister's Office, Ministry of Agriculture and Institute of Adult Education ; edited by H. Hänsel, J. de Vries & P. C. Ndedya