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A SOURCE BOOK

in

GEOLO

by

KIRTLEY F. MATHER, Ph.D., Sc.D.

Professor of Geology, Harvard University

and

SHIRLEY L. MASON, Ph.D

. Geologist, Houston, Texas

FIRST EDITION S2COND IMPRESSION

McGRAW-HILL BOOK COMPANY, Inc.

NEW YORK AND LONDON 1939

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