책 세부 정보
형식
페이퍼백
페이지
112
언어
영어
출판됨
Mar 1, 2015
출판사
Usborne Publishing Ltd
ISBN-10
1409584615
ISBN-13
9781409584612
설명
Children love to learn secret codes and write encrypted messages and this book will teach them everything they need to know, including Semaphore and Morse code, Grid code (used in the American Civil War), Egyptian hieroglyphics and traditional number replacement and alphabet switching codes.