The Frozen Echo: Greenland and the Exploration of North America ca A.D. 1000-1500.

Interesting study of the Norse settlement in Greenland during its chief period, and its demise.

p. 311: But both circumstantial evidence and common sense suggest that the Greenlanders, who had so clearly taken active part in the North Atlantic economic community throughout the fifteenth century, had remained opportunists to the end and joined the early-sixteenth-century European surge toward North America.