جزئیات کتاب
فرمت
جلد نرم
صفحات
112
زبان
انگلیسی
منتشر شده
Mar 1, 2015
ناشر
Usborne Publishing Ltd
ISBN-10
1409584615
ISBN-13
9781409584612
توضیحات
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.