Image: Zygalski sheets (perforated sheets)
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Description: Demonstration of Zygalski_sheets (perforated sheets) at Bletchley Park, photographed by Toby Oxborrow.
Title: Zygalski sheets (perforated sheets)
Credit: https://www.flickr.com/photos/oxborrow/37527502/in/set-828575/
Author: Toby Oxborrow
Permission: This file is licensed under Creative Commons Attribution ShareAlike 2.0 License.
Usage Terms: Creative Commons Attribution-Share Alike 2.0
License: CC BY-SA 2.0
License Link: https://creativecommons.org/licenses/by-sa/2.0
Attribution Required?: Yes
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