Secret codes
By: Ken Beatty
Series: Penguin active reading. Level 4; Penguin active reading
Publisher: Penguin Longman
Published: 2007
Place of publication: Harlow
Language: eng
Number of pages: 75
ISBN-13: 9781405852227; 9781405850872
Subjects: Juvenile literature; Cryptography; Readers
Notes: Includes CD-ROM and audio disc.