Note: This calendar view maps the number of captures of http://www.albertasource.ca/realestate/multimedia/display_audio.php?url=http://www.albertasource.ca/realestate/audio/HeritageTrails_371.mp3&title=The%20real%20estate%20slump%20in%20World%20War%20One, not how many times the site was actually updated.
Look Up URL in general Internet Archive web collection.