Savan, Beth.

Earthcycles and ecosystems / Beth Savan ; illustrated by Pat Cupples. - Toronto : Kids Can Press, 1991.

Includes index.

ISBN: 155074013X :

Nat. Bib. Agency Control No.: 910933715

Subjects--Topical Terms:
Ecology--Juvenile literature.
Biotic communities--Juvenile literature.
Man--Influence on nature--Juvenile literature.

Subjects--Index Terms: Ecology

Dewey Class. No.: j574.5