Robert Michael Ballantyne 
Norsemen in the West [EPUB ebook] 

One fine autumn evening, between eight and nine hundred years ago, two large hairy creatures, bearing some resemblance to polar bears, might have been seen creeping slowly, and with much caution, toward the summit of a ridge that formed a spur to one of the ice-clad mountains of Greenland. The creatures went on all-fours. They had long bodies, short legs, shorter tails, and large round heads