Messengers, Morse code, and modems
By: by Janice Parker.
Series: Science@work; Science at work (Calgary, Alta.)
Publisher: Weigl Educational Publishers
Published: 2000
Place of publication: Calgary, AB
Language: eng
Number of pages: 48
Subjects: Communication -- Juvenile literature.
Genres: Juvenile literature.
Other titles: Communication
Notes: At head of title: Communication.

Includes index.

CR