Title: Systematics and evolution of Phacops rana (Green, 1832) and Phacops iowensis Delo, 1935 (Trilobita) from the Middle Devonian of North America
First published: 1972
Subjects: Paleontology, Phacops
Places: North America
Time periods: Devonian
LC classification: QH1 .A4 vol. 147, art. 2, QE821 .A4 vol. 147, art. 2