ISBN:

• 9780789160980
• 9780756944650
• 0789160986
• 0756944651

Description: 40 pages : color illustrations, color maps ; 24 cm.

Notes: Includes bibliographical references (pages 36-37) and index.

Control Number: 368456

Series:

• Reading essentials in science. Communities of life
• Reading essentials in science. Communities of life.

Subjects:

• Rivers -- Juvenile literature.
• Stream ecology -- Juvenile literature.