Effects of Public Law 480 programs in Colombia: 1955-62. A progress report to the Economic Research service of the United States Dept. of Agriculture, under contract no. 12-17-0017-52, Project no. 11252-21
by Lawrence W. Witt and Richard G. Wheeler with the collaboration of Guillermo A. Guerra E. and Francisco J. Ortega A. and based in part on material prepared by Theodore James Goering
Medellin, Colombia : Dept. of Agricultural Economics, Michigan State University and Departamento de EconomÃa y Ciencias Sociales, Facultad de AgronomÃa e Instituto Forestal, Universidad Nacional de Colombia, 1962