A monograph of the existing crinoids: 1. The Comatulids. Part 2
Clark, A.H. (1921). A monograph of the existing crinoids: 1. The Comatulids. Part 2. Bulletin of the United States National Museum, 82. United States Government Printing Office: Washington D.C.795, 57 plates pp.
Deel van: Bulletin of the United States National Museum. Smithsonian Institution: Washington. ISSN 0362-9236, meer
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