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Excerpt from Maryland Geological Survey: Lower Cretaceous The necessity of some sort of systematic treatment of the maze of described forms in the literature of the Potomac which would enable the geologist or the botanist to obtain some idea of the ora has long been felt. The pre-existing multiplicity of species has made it necessary to retain a number of extremely doubtful forms. Many have, however, disappeared by reduction to synonymy, and some basis for the correlation of a number of genera with their living representatives has become apparent during the progress of the work. 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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