https://www.catholic.com/encyclopedia/charles-louis-joseph-xavier-de-la-vallee-poussin
Charles-Louis-Joseph-Xavier de La Vallee-Poussin | Catholic Answers Encyclopedia
Vallee-Poussin, CHARLES-LOUIS-JOSEPH-XAVIER DE LA, professor of geology and mineralogy at the Catholic University of Louvain (1863), doctor honoris causa of...
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