Earthwatch
Subtitle: earthcycles and ecosystems
By: written by Beth Savan ; illus. by Pat Cupples
Publisher: Addison-Wesley
Published: 1991
Language: eng
Number of pages: 96
ISBN-13: 9780201581485
Subjects: Ecology; Study and teaching; Activity programs; Children's material; Conservation of natural resources; Biotic communities; Science projects; Pollution