Toscanelli and Columbus. The letter and chart of Toscanelli on the route to the Indies by way of the West, sent in 1474 to the portuguese Fernam Martins, and later on to Christopher Columbus. A critical study on the authenticity and value of these documents and the sources of the cosmographical ideas of Columbus, followed by the varius texts of the letter, with translations, annotations, several facsimiles and also a map - Vignaud, Henry (Sands & Co., 12 Burleigh street, Strand, 1902)