History of studies and restorations of the Prado Museum (Madrid)
History of studies and restorations of the Prado Museum (Madrid)
J. Paul Getty Museum Painting Collection (Los Angeles)
Collection of digitised maps from the Map Library of the Universitat Autònoma de Barcelona
Map collection of the University of Cantabria Map Library
Documentary reference of historical maps referring to the current territory of Cantabria in Spanish archives (contains some historical maps)
On-line catalogue of the Dominique-Vivant Denon Research Centre (Paris)
On-line catalogue of the collections of the Graphic Arts Department of the Louvre Museum (Paris)
Online Collection of the National Museum of Stockholm (Sweden)
Public domain images from the National Museum in Stockholm, Sweden
Art Bulletin of the National Museum of Stockholm (Sweden)