And yet here, in a book published in 1507, were references to a large world map that showed a new, fourth part of the world and called it America. The references were tantalizing, but for those ...

The famous Waldseemuller map, which in 1507 depicted the Americas for the first time, appears to have borrowed heavily from Martellus. To see the writing, researchers photographed the 6- by 4-foot ...