On the charting school of Dieppe see www.sullacrestadellonda.it/cartografia/francia2_en.htm ;
Transactions of the Royal Society of Canada, serie 3, volume 27, section II (May 1933) : John Blake: Vermessung der Meere (2007: 25) ; Monique La Roncière et Michel Mollat du Jourdin: Les Portulans: cartes marines du XIIIe siècle (Fribourg: Office du Livre, 1984) ;
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