| Citation | Downey, M.E. 1968 Catalog of recent echinoid type specimens in the U.S. National Museum Smithsonian Institution and the Museum of Comparative Zoology Harvard University. Bulletin of the United States National Museum 264:1-99. |
| DOI / ISBN | |
| Paper URL | http://si-pddr.si.edu/jspui/handle/10088/10083 |
| Ref. No. | 89086 |
| Language | English |
| Usage | not used yet |
| Remarks | |
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