Staton, R. D., Museum of Comparative Zoology at Harvard College

• Digital Treatise Part H, Brachiopoda, vol. 1 & 2 (1965) - Chapters
  Part H, Brachiopoda, vol. 1 & 2, ch. 6, p. 632-728
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• Digital Treatise Part H, Brachiopoda, vol. 1 & 2 (1965) - Chapters
  Part H, Brachiopoda, vol. 1 & 2, Complete Volume
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