A revision of the Ordovician Trilobite genus Plaesiacomia Hawle & Corda, 1847. W. T. Dean 1966 | volume 22 | issue 4 | pages 133–142 PDF
A revision of the Ordovician Trilobite genus Bathycheilus Holub. W. T. Dean 1965 | volume 21 | issue 1 | pages 1–10 PDF
