|Dec-1931||Parasitology in its relation to other sciences||Hall, Maurice C.|
|Dec-1931||Studies on the Cultivation of Parasitic Intestinal Protozoa||Poindexter, Hildrus A.|
|Dec-1931||Nutritional Studies of the Food Stuffs used in the Porto Rican Dietary||Cintrón, Carlos L.; Cook, Donald H.|
|Dec-1931||Isohemagglutination and Blood Grouping. Their relation to transfusion||Serra, Americo|
|Dec-1931||Fusospirochetal Infection of the Vagina ( Report of a Case Occuring in Porto Rico)||Costa Mandry, O. ( see also / véase además Costa Mandry, Oscar)|
|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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