U.S. Geological Survey Photographic Library

ID. Hamilton, W.B. 1329ct

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Specimens of granite. Fine granite, rhyolite, porphyry rhyolite. Precambrian, St. Francis Mountains. Missouri. April 1965.

Specimens of granite. Fine granite, rhyolite, porphyry rhyolite. Precambrian, St. Francis Mountains. Missouri. April 1965.

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