Abstract
Every known variety of Keystone State building stone, assembled from Pennsylvania's 80,000 square miles of earth's crust, may be seen on the Pennsylvania State College campus in a “monument,” known as the Polylith, which is only six feet square at the base. The Polylith is so constructed that the rock formations of the State, arranged in exactly the same order in which they occur in nature, may be seen at a glance.
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