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_461.mp3&title=The%20oil%20boom%20after%201947%20and%20the%20accompanying%20housing%20crisis, not how many times the site was actually updated.
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