Goetzmann, W H., & Williams, G. (1998). The atlas of North American exploration: From the Norse voyages to the race to the Pole(Paperback ed.). Norman: Univ. of Oklahoma Press.

The atlas of North American exploration : From the Norse voyages to the race to the Pole / William H. Goetzmann; Glyndwr Williams . — Paperback ed.. — Norman : Univ. of Oklahoma Press, 1998. — 224 S.; zahlr. Ill., Kt. — ISBN 080613058X, 9780806130583

Goetzmann, William H., and Glyndwr Williams. The Atlas of North American Exploration: From the Norse Voyages to the Race to the Pole.Paperback ed.Norman: Univ. of Oklahoma Press, 1998.