@misc{indiciaed8f5cba7c3ab,
  title = {Updated operational protocols for the U.S. Geological Survey Precipitation Chemistry Quality Assurance Project in support of the National Atmospheric Deposition Program},
  author = {Gregory A. Wetherbee and RoseAnn Martin},
  year = {2017},
  doi = {10.3133/ofr20161213},
  url = {https://pubs.usgs.gov/publication/ofr20161213},
  note = {Source identifier: ofr20161213}
}