Oklahoma aerial photographs in this collection are public domain and were created by U.S. government agencies or contractors to those agencies. The photos are marked with a flight and frame number at the top of the photos, e.g., AQS-219. The date of the flight is then printed in the opposite corner. More information about these photos can be found at: http://guides.ou.edu/aerial. Digital imaging courtesy of the University of Oklahoma Libraries, Government Documents Collection.