Journal Article ADMINISTRATION OF PROGESTERONE IN THE FORM OF MICROCRYSTALS Get access OSCAR KOREF, OSCAR KOREF 1From the Research Department of “Laboratorios Hormona,” Bogotá, Colombia Search for other works by this author on: Oxford Academic Google Scholar PAUL ENGEL PAUL ENGEL 1From the Research Department of “Laboratorios Hormona,” Bogotá, Colombia Search for other works by this author on: Oxford Academic Google Scholar Endocrinology, Volume 38, Issue 3, 1 March 1946, Pages 214–215, https://doi.org/10.1210/endo-38-3-214 Published: 01 March 1946 Article history Received: 21 January 1946 Published: 01 March 1946