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LIBRARY

OF THE

UNIVERSITY.

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AUTHOR'S EDITION.

COLLEGE LIBRARY.

DEPARTMENT OF THE INTERIOR. UNITED STATES GEOLOGICAL AND GEOGRAPHICAL SURVEY. F. V. HAYDEN, U. S. Geologist-in-Charge.

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EXTRACTED FROM THE BULLETIN OF THE SURVEY, VOL. IV, No. 2.

WASHINGTON, May 3, 1878.

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