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sa=t&rct=j&q=&esrc=s&source=web&cd=8&cad=rja&uact=8&ved=0ahUKEwjh49qbivbVAhVLLMAKHXxABd8QFghQMAc&url=https%3A%2F%2Fjournals.lib.unb.ca%2Findex.php%2Fihr%2Farticle%2FviewFile%2F23264%2F27040&usg=AFQjCNFVWtdOgY4dx2eM8MkIsVV97rFHrQ THE CONTROVERSIAL ORIGINS OF MEDIEVAL NAUTICAL CARTOGRAPHY. Paula PRESCIUTTINI
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sa=t&rct=j&q=&esrc=s&source=web&cd=13&ved=0ahUKEwiK057Px_rVAhXKIsAKHQWCCo4QFghjMAw&url=https%3A%2F%2Fjournals.lib.unb.ca%2Findex.php%2Fihr%2Farticle%2Fdownload%2F23740%2F27513&usg=AFQjCNGMyYIX_fe0iOD51TbI3usv-_-MUw 500 YEARS OF GRAPHICAL AND SYMBOLICAL REPRESENTATION
ON MARINE CHARTS by Rear Admiral G.S. Ritchie