num_pages: 64
description: Explains how to write and decipher space codes, hidden word codes, and alphabet codes and gives formulas for invisible ink. Includes suggestions for delivering coded messages.
language: English
title: How to Write Codes and Send Secret Messages
titlecomplete: How to Write Codes and Send Secret Messages
genres: Childrens, Nonfiction
ratings_count: 14
publisher: Scholastic Paperbacks