[Illustration: PUBLISHED BY THE GLACIER NATURAL HISTORY
ASSOCIATION
IN COOPERATION WITH THE NATIONAL PARK SERVICE]
[Illustration: NATIONAL PARK SERVICE]
Cover
Surveying Sperry Glacier—Arthur Johnson of U. S. G. S.
N. P. S. Photo by J. W. Corson
REVISED 1966
REPRINT 1971
THOMAS PRINTING 5M71