Official Bulletin of the Department of Health of Porto Rico and the School of Tropical Medicine of the University of Porto Rico Under the Auspices of Columbia University [Formerly Porto Rico Review (Vol.I & II) and Porto Rico Review of Public Health and Tropical Medicine (Vol. III & IV)]. Bilingual articles published from Vol. VIII- XXV (Sept. 1932-June 1950). Published quarterly (September, December, March and June) by the Department of Health of Porto Rico San Juan,P.R., Bureau of Supplies, Printing and Transportation. until Jun.1938 and by Columbia University Press, Menasha, Wis. for the School of Tropical Medicine of University of P.R., under the auspices of Columbia University and co-operation of the Department of Health of Porto Rico from Sept. 1938 to June1950.