You might find this old children's book to be interesting reading, especially this section:

http://www.gutenberg.org/files/24811/24811-h/24811-h.htm#Pag...

Some of the text on Wikipedia is interesting as well:

http://en.wikipedia.org/wiki/Greenland#Norse_settlement

And if you look back to read _The Saga of Eric the Red_ (http://www.americanjourneys.org/aj-056/index.asp), you can see references to "ice mountain" and so on.