@misc{indiciae85642766d301,
  title = {Cenozoic history of the Bering land bridge},
  author = {David M. Hopkins},
  year = {1959},
  doi = {10.1126/science.129.3362.1519},
  url = {https://pubs.usgs.gov/publication/70211616},
  note = {Source identifier: 70211616}
}