Some trilobites of the lower middle ordovician of eastern North America
By: by Percy E. Raymond
Series: Bulletin of the Museum of Comparative Zoology at Harvard College -- vol. 67, no. 1; Bulletin of the Museum of Comparative Zoology -- v. 67, no. 1
Publisher: Museum of Comparative Zoology
Published: 1925
Place of publication: Cambridge, Mass
Language: eng
Number of pages: 180
Subjects: Paleontology; Trilobites