Some trilobites of the Lower Middle Ordovician of eastern North America
By: by Percy E. Raymond.
Series: Bulletin of the Museum of Comparative Zoölogy at Harvard College -- v. 67, no. 1; Bulletin of the Museum of Comparative Zoology -- v. 67, no. 1.
Publisher: Printed for the Museum
Published: 1925
Place of publication: Cambridge, Mass
Language: eng
Number of pages: 180
Subjects: Trilobites.; Paleontology -- United States.; Paleontology -- Ordovician.
Other titles: Ordovician trilobites