http://www.raremaps.com/gallery/detail/17272/Leo_Belgicus/Van%20Den%20Keere.htmlhttp://www.reusableart.com/vintage-mapshttp://publicdomainreview.org/collections/maps-from-geographicus/http://openglam.org/2014/03/31/nypl-releases-20-000-historical-maps-as-public-domain/http://www.maphistory.info/https://commons.wikimedia.org/wiki/Old_maps#Europe
