This unsigned map has highly contested authorship. Charles de La Ronciere attributed it to Christopher and Bartholomew Columbus, though others have suggested it may have been commissioned rather than created by them, or the creator may have only had an indirect connection to the Columbus brothers. The map was created sometime between 1492 and 1500, based on the limits of geographic discoveries and the political demarcation of a Spanish flag in Granada.]]> http://expositions.bnf.fr/marine/grand/por_013.htm]]> http://gallica.bnf.fr/ark:/12148/btv1b59062629]]> Bibliothèque Nationale de France, Galicia. “Carte marine de l'océan Atlantique Nord-Est, de la mer Baltique, de la mer Méditerranée et de la mer Noire, accompagnée d'une mappemonde circulaire.” Accessed June 4, 2018. http://gallica.bnf.fr/ark:/12148/btv1b59062629/f1.item.r=carte%20christophe%20colomb.zoom
Astengo, Corradino. “The Renaissance Chart Tradition in the Mediterranean” In The History of Cartography, Volume 3, edited by David Woodward, 174-177. Chicago: University of Chicago, 2007.
La Carta De Cristóbal Colón: Mapa Portulano, Ca. 1492-1500. Barcelona: M. Moleiro Editor, S.A., 1995.
Siebold, Jim. “The Christopher Columbus Chart.” Map Index #257. Last updated May 28, 2018. http://www.myoldmaps.com/late-medieval-maps-1300/257-the-christopher-columbu/257-columbus.pdf ]]> Carleton Library Special Collections Map (Map, Rolled) G3201.P5 1492 .C3 1995]]>