Amsden, T. W. (1974). Late Ordovician and early Silurian articulate brachiopods from Oklahoma, southwestern Illinois, and eastern Missouri. <em>Oklahoma Geological Survey Bulletin.</em> 119: 1-154.[details]
original descriptionAmsden, T. W. (1974). Late Ordovician and early Silurian articulate brachiopods from Oklahoma, southwestern Illinois, and eastern Missouri. <em>Oklahoma Geological Survey Bulletin.</em> 119: 1-154.[details]
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