File:Prism slide 2.jpgDescriptionPrism slide 2.jpg English: PRISM: Introduction Date 7 June 2013, 07:50:52 Source original image | source Author National Security Agency
File:Turtle Mountain prism.jpgDescriptionTurtle Mountain prism.jpg English: Prism used to monitor the movement of Turtle Mountain, site of the Frank Slide in Crowsnest Pass, Alberta
File:Reflex Focus Cover.jpgThis file is licensed under the Creative Commons Attribution 2.0 Generic license. You are free: to share – to copy, distribute and transmit the work to
