![](http://www.alamy.com/thumbs/6/A5B2F234-F4E7-4B37-AF23-502C155C4610/2X3XJRP.jpg)
Historical World War 2 index cards in a box at Bletchley Park, Buckinghamshire.
Size: 3373px × 4800px
Location: Bletchley Park, Buckinghamshire
Photo credit: © Pez Photography / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: analog, archives, artifacts, base, bletchley, box, breakers, buildings, cards, code, codebreaking, collections, conservation, cryptography, cryptologists, decryption, devices, encryption, england, equipment, exhibits, handwritten, heritage, historic, historical, history, index, intelligence, kingdom, machines, methods, military, museum, operations, park, pieces, preservation, relics, roledex, secret, secrets, security, sites, storage, technology, tours, united, vintage, war, wartime, wwii