To access World Book Online click here then scroll down the right side of the box to find the World Book.
Battle Teaching
Scroll down to Operation Husky
World War II Topographical Map Series
Click on the above link, then scroll down to find links to specific countries
Digital Archive from McMaster University
Allows zooming in and out
Example:
Caen - Falaise 1943
http://digitalarchive.mcmaster.ca/islandora/search/falaise?type=dismax
Internet Modern History Sourcebook