@misc{indiciae130c83580847,
  title = {Fieldiana. Zoology / The viperid snake Azemiops: its comparative cephalic anatomy and phylogenetic position in relation to Viperinae and Crotalinae — Illustration, Fig. 4 / Page 72},
  year = {1971},
  url = {https://www.biodiversitylibrary.org/page/2836487},
  note = {Source identifier: page-2836487}
}