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Showing the ten chief physiographic provinces into which the state is divided — Mohawk Valley, Hudson Valley, Long Island, Champlain, Adirondack Mountains, St. Lawrence Valley, Tug Hill Plateau, Erie-Ontario Plain, Catskill Mountains, Southwestern Plateau. From the Geological History of New York State by William J. Miller, Ph. D., reproduced by courtesy of Dr. Miller, who was professor of geology at Hamilton College, Clinton, Oneida County, at the time of the writing of this book.