A monograph on the genera Zethus, Cybele, Encrinurus, and Cryptonymus Vogdes, Anthony Wayne, 1843-1923 creator text book CHarleston, S.C 1878 1878
print
ENG Arthropoda, Fossil Invertebrates, Fossil Paleontology Trilobites TR16.7 .V86m Museum of Comparative Zoology--Biodiversity Heritage Library digitization project https://www.biodiversitylibrary.org/bibliography/11064 11949225 10.5962/bhl.title.11064 CLU