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File:NORADNorth-Portal.jpg

Summary

Description
English: Photo of the North Portal entrance to Cheyenne Mountain
Deutsch: Nördlicher Eingang von NORAD im Cheyenne Mountain.
Date Unknown date
Source Originally https://www.cheyennemountain.af.mil/Cool-Pics/CMAFSPhotos/North-Portal.jpg via https://www.cheyennemountain.af.mil/Cool-Pics/CMAFSPhotos05.htm, now offline.
Cropped version available at http://www.norad.mil/Images/Historic/North-Portal_large.jpg via http://www.norad.mil/about/CMOC.html.
Author Unknown
Permission
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