@misc{indiciaeed19342afadf,
  title = {Helium and C1-C3 hydrocarbon concentrations in permafrost ice, Marsh Creek area, Arctic National Wildlife Refuge, Alaska},
  author = {K.I. Cunningham and A.A. Roberts},
  year = {1988},
  doi = {10.3133/ofr881},
  url = {https://pubs.usgs.gov/publication/ofr881},
  note = {Source identifier: ofr881}
}