Books by Petrus Franciscus Langlois:
Books in the extended shelves:
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Langlois, Petrus Franciscus: Quinquaginta decisiones imperatoris Iustiniani quae a secundo libro codicis ... : cum quadringentis praecipuis quaestionibus forensibus [et] conclusionibus ... (apud Ioannem Keerbergium, 1622), also by Jan van Keerberghen, Universidad Complutense (Alcalá de Henares), Colegio Imperial (Jesuitas), and Colegio Mayor de San Ildefonso (Alcalá de Henares) (page images at HathiTrust)
Find more by Petrus Franciscus Langlois at your library, or elsewhere.