[Illustration: Bighorn sheep]
NATURAL HISTORY HANDBOOK SERIES NO. 3
_Washington, D.C., 1954 (Revised 1963)_
[Illustration: NATIONAL PARK SERVICE · DEPARTMENT OF THE INTERIOR]
NATIONAL PARK SERVICE
Natural History Handbook Series
No. 1. Olympic National Park
No. 2. Badlands National Monument
No. 3. Rocky Mountain National Park
No. 4. Saguaro National Monument
No. 5. Great Smokey Mountains National Park