Carlos Sanz was the author of several articles and books dealing with cartography and the discovery of the New World. The Sanz map collection includes 19 reproductions of maps and charts originally published between 1482 and 1598 by well known cartographers such as Mercator, Juan de la Cosa, Contarini, and Ptolemy. These maps form part of 50 items reproduced and published with a commentary by Sanz in his two volume work entitled Mapas antiguos del mundo: (siglos XV-XVI) (Madrid, 1962).