SKU:AA/SC/16783
Codes; Secret Writing; Authorized Abridgement. Step-by-Step explanations of how secret codes can be made. Here you can practice both encoding and decoding. 115 Pages. Very Good
AUTHOR: Herbert S. Zim PUBLISHER: Scholastic Book Service ISBN: YEAR: 1967 FORMAT: Softcover EDITION: 13th Printing, December 1967