@misc{indiciae804f1ac20c9d,
  title = {Simple devices for measuring out small quantities of liquid},
  author = {F. C. Calkins},
  year = {1946},
  doi = {10.1021/ed023p604},
  url = {https://pubs.usgs.gov/publication/70010901},
  note = {Source identifier: 70010901}
}