@misc{indiciaeb42bf00ea1f3,
  title = {Lecture experiments in general chemistry. VI. The liquefaction and fractionation of air. VII. The liquefaction and fractionation of natural gas},
  author = {S. Morris and A.J.W. Headlee},
  year = {1941},
  doi = {10.1021/ed018p79},
  url = {https://pubs.usgs.gov/publication/70011064},
  note = {Source identifier: 70011064}
}