@misc{indiciae3f6939fab19a,
  title = {Gas-driven pump for ground-water samples},
  author = {Donald C. Signor},
  year = {1978},
  doi = {10.3133/wri7872},
  url = {https://pubs.usgs.gov/publication/wri7872},
  note = {Source identifier: wri7872}
}