What parts of the world were covered with glaciers during the Ice Age?

Answer 1

http://www.metatech.org/Images/ice%20age%20world%20map.jpg

Answer 2

You might also be interested in the following by Stephen Oppenheimer which shows the coverage by ice during Ice Ages in the context of the movement of man.

http://www.bradshawfoundation.com/journey/

Answer 3

what part of the world was covered with glaser