Williams, J., & Madog ab Oivain Gwynedd, 1. (1792). Farther observations on the discovery of America by Prince Madog ab Owen Gwynedd about the year 1170: Containing the account given by General Bowles, the Creek or Cherokee Indian, lately in London, and by several others, of a Welsh Tribe or Tribes of Indians, now living in the Western parts of North America. London: J. Brown.

Williams, John, and 1150-1180? Madog ab Oivain Gwynedd. Farther Observations On the Discovery of America By Prince Madog Ab Owen Gwynedd About the Year 1170: Containing the Account Given By General Bowles, the Creek or Cherokee Indian, Lately in London, and By Several Others, of a Welsh Tribe or Tribes of Indians, Now Living in the Western Parts of North America. London: J. Brown, 1792.

Williams, John, and 1150-1180? Madog ab Oivain Gwynedd. Farther Observations On the Discovery of America By Prince Madog Ab Owen Gwynedd About the Year 1170: Containing the Account Given By General Bowles, the Creek or Cherokee Indian, Lately in London, and By Several Others, of a Welsh Tribe or Tribes of Indians, Now Living in the Western Parts of North America. London: J. Brown, 1792.