|Dec-1931||Skin Reactions to Necator Americanus in Persons Infected with the common intestinal parasites||Bachman, George W.; Rodríguez Molina, Rafael|
|Dec-1931||Filariasis in Porto Rico||Hoffman, William A.; Marín, Rafael Angel; Burke, Alice M.|
|Dec-1931||An Epidemiological Study of Hookwrom disease in a roral coastal plain and a city area of Porto Rico||Daengsvang, Svasti|
|Dec-1931||Brief Summary of Findings on Flora of Normal Throats in San Juan, Porto Rico June 1929-30||Morales Otero, Pablo|
|Dec-1931||Notes on the Life History of Anopheles Albimanus and Grabhamii||Earle, Walter C.|
|Dec-1931||Abstracts of Current Literature||Department of Health of Porto Rico|
|Dec-1931||Statistical Reports||Department of Health of Porto Rico|
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