00501nam a2200121Ia 4500008004100000040001700041082002300058110005800081245006500139260003500204300001400239650012600253190328s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta301.24bU58S  aUnited Nations. Economic Commission for Latin America 0aSocial change and social development policy in Latin America  aNew YorkbUnited Nationsc1970  avi, 318p.  aSocial change-Latin America; Social planning-Latin America; Social structure-Latin America; Social mobility-Latin America