by Arthur E. Taylor ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry in cooperation with the University of Georgia, College of Agriculture
by P.R. McMiller ... [and others] ; United States Department of Agriculture, Bureau of Plant Industry ; in cooperation with the University of Minnesota Agricultural Experiment Station
autores, Carlos E. Brockmann H. (director Programa "ERTS" [and others] ; cartografía y separación a colores, Oscar Torrez W. (dirección), Estela Pinto M. (operación), Eduardo Pacheco A. (colaboración)