[Portolan atlas of 9 charts and a world map, etc. Dedicated to Hieronymus Ruffault, Abbot of St. Vaast].

Manuscript, pen-and-ink and watercolor, on vellum.
Each double-page illumination (col. diagrs., col. maps) 21 x 29 cm. Compass rose on inside back cover.
"Maps 1, 2, and 10 show America. No. 1 shows the Gulf of California which Ulloa discovered in 1539. On the same map Yucatan is shown as an island, and the east and west coasts of North and South America are only partially shown. On no. 2, the east coasts of North and South America are shown in their entirety and the west coasts only partially. Clumps of trees in green and gold are shown on no. 1, near the Noluccas, and on no. 2, in the Brazilian region of South America. The oval world map (no. 10) shows Magellan's route around the world and a route from Spain to Peru. The 12 wind cherubs on this map are named." -- Ristow and Skelton, Nautical charts on vellum in the Library of Congress, 1977.
LC Nautical charts on vellum, 5
Rosenthal 1914, 1884
Ruge 1916, p. 17-18
Wagner 1931, 33
Skelton , 19
Available also through the Library of Congress Web site as a raster image.
Vault