Jeffords, Russell M., Exxon Production Research Company

• Digital Treatise Part T, Echinodermata 2, vol. 1-3 (1978) - Chapters
  Part T, Echinodermata 2, vol. 1-3, ch. 8, p. 813 - 937
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• Digital Treatise Part T, Echinodermata 2, vol. 1-3 (1978) - Chapters
  Part T, Echinodermata 2, vol. 1-3, Complete Volume
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