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LIBRARY
OF THE
UNIVERSITY.
AUTHOR'S EDITION.
COLLEGE LIBRARY.
DEPARTMENT OF THE INTERIOR. UNITED STATES GEOLOGICAL AND GEOGRAPHICAL SURVEY. F. V. HAYDEN, U. S. Geologist-in-Charge.
EXTRACTED FROM THE BULLETIN OF THE SURVEY, VOL. IV, No. 2.
WASHINGTON, May 3, 1878.