Detalles del libro
Formato
Tapa blanda
Páginas
112
Idioma
Inglés
Publicado
Mar 1, 2015
Editorial
Usborne Publishing Ltd
ISBN-10
1409584615
ISBN-13
9781409584612
Descripción
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.