Richardson, J. R., Museum of Victoria

• Digital Treatise Part H, Brachiopoda (Revised), vol. 1 (1997) - Chapters
  Part H, Brachiopoda (Revised), vol. 1, ch. 5, p. 441–472
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• Digital Treatise Part H, Brachiopoda (Revised), vol. 1 (1997) - Chapters
  Part H, Brachiopoda (Revised), vol. 1, Complete Volume
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