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The relation of the different primary regions and their subdivions may be approximately indicated diagrammatically as follows:

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COLLEGE | LIBRARY

AUTHOR'S EDITION.

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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