I noticed yesterday in S.E. Morison's The European Discovery of America: The Northern Voyages, a mention of a book of exploration (mostly toward the far north,

I noticed yesterday in S.E. Morison's The European Discovery of America: The Northern Voyages, a mention of a book of exploration (mostly toward the far north, apparently), Inventio Furtunata (or Fortunae), mentioned in a letter to Columbus from an English merchant. At the time Morison wrote, nobody had been able to find the book or a clear account of it.