Neogondolelliform conodonts of early and middle Pennsylvanian age Von Bitter, Peter H. creator Merrill, Glen K. contributor Royal Ontario Museum. contributor text book Toronto Royal Ontario Museum 1977 1977
print
ENG "15 June 1977." Conodonts Paleontology Pennsylvanian QE899 .T654 no. 29 574 s Life sciences occasional papers, no. 29 0082-5107 https://www.biodiversitylibrary.org/bibliography/60684 088854197X 3763545 81485262 10.5962/bhl.title.60684