[The 50th anniversary of the Boletin de la Oficina Sanitaria Panamericana, 1922-1972].
D002489:Central America; D049673:History, 20th Century; D007390:International Agencies / Q000266:history*; D008800:Mexico; D010506:Periodicals as Topic / Q000266:history*; D011634:Public Health / Q000266:history*; D013020:South America
Cincuentenario del boletín de la Oficina Sanitaria Panamericana, 1922-1972.