Gonzalvo-Cirac, Margarita. “¿Why Descended Child Mortality in Tarragona, Province of Catalonia (Spain)? The Example of Doctor Frías I Roig (Reus, 1878-1963)”. Población y Salud en Mesoamérica 13, no. 1 (June 30, 2015). Accessed April 18, 2024. https://revistas.ucr.ac.cr/index.php/psm/article/view/19918.