@misc{indiciae0d73e56186d3,
  title = {Dissolved methane in groundwater, Upper Delaware River Basin, Pennsylvania and New York, 2007-12},
  author = {William M. Kappel},
  year = {2013},
  doi = {10.3133/ofr20131167},
  url = {https://pubs.usgs.gov/publication/ofr20131167},
  note = {Source identifier: ofr20131167}
}