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Excerpt from What About Our Minerals?: A Quiz Book on the Geology and Mineral Resources of Illinois Most of this covering was formed during the Glacial period when, as the glaciers melted away, they left behind the glacial drift pebbly clay, sand, gravel, and boulders that had been picked up by the over-riding ice as it moved southward. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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9781334479045

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