@misc{indiciaeabb132346da3,
  title = {The Mauna Loa carbon dioxide record: lessons for long-term Earth observations},
  author = {Eric T. Sundquist and Ralph F. Keeling},
  year = {2009},
  doi = {10.1029/2009gm000913},
  url = {https://pubs.usgs.gov/publication/70046069},
  note = {Source identifier: 70046069}
}