Bagrow, Leo

History of cartography / Leo Bagrow ; revised and enlarged by R.A. Skelton.  2nd ed. Chicago : Precedent Publishing, 1985. 312 pages : illustrations (some col.) ; 28 cm.

Williamson, James Alexander

The Cabot voyages and Bristol discovery under Henry VII / by James A. Williamson ; with cartography of the voyages by R. A. Skelton.  Cambridge : Published for the Hakluyt Society at the University Press, 1962. xvi, 332 pages, [11] pages of plates (some folded) :

Skelton, Raleigh Ashlin

Vinland map and the Tartar relation New Haven : Yale University Press, 1965. 291 pages