TY - BOOK ID - 125776105 TI - Codes, ciphers, and secret writing PY - 1984 SN - 0486247619 PB - New York : Dover, DB - UniCat KW - Cryptography. KW - Ciphers. KW - Codage UR - https://www.unicat.be/uniCat?func=search&query=sysid:125776105 AB - ER -