Chelala, César A. creator text bibliography dcu Washington, D.C Organización Panamericana de la Salud, Oficina Sanitaria Panamericana 1997 monographic spa 42 p. col. ill. 25 cm. specialized Includes bibliographical references (p. 39-41). cl----- Urban Health Latin America RA566.5.L29 C46 1997 362.1/098/091732 9275320608 98159335 DLC 980611 20160527193527.0 266814