Trilobites of the Upper Cambrian Ptychaspic biomere
Subtitle: Wilberns formation, central Texas
Series: Texas. University. Bureau of Economic Geology. Report of investigations -- no. 66; Report of investigations (University of Texas. Bureau of Economic Geology) -- no. 66.
Publisher: [Bureau of Economic Geology, University of Texas at Austin]
Published: 1970
Place of publication: [Austin]
Language: eng
Number of pages: 70
Subjects: Trilobites; Paleontology
Notes: "Reprint of Memoir 4, Paleontological Society."

Bibliography: p. 58-61.