| Title |
|---|
| Treatise on Invertebrate Paleontology. Part P Arthropoda 2 Chelicerata with sections on Pycnogonida and Palaeoisopus. Author: Stormer, Leif and Petrunkevitch, Alexander and Hedgpeth, Joel W. (Moore, Raymond C. ed) 1955 Geological Society of America and University of Kansas Press |