Bioconversion of organic residues for rural communities: papers presented at the Conference on the State of the Art of Bioconversion of Organic Residues for Rural Communities, held at the Institute of Nutrihon of Central America and Panama, Guatemala City, Guatemala, 13-15 November 1978 - Conference on the State of the Art of Bioconversion of Organic Residues for Rural Communities ( (1978:) (Food and nutrition bulletin supplement, 1979)