@misc{indiciae1a4bbda82e6e,
  title = {Application of semipermeable membrane devices (SPMDs) as passive air samplers},
  author = {Jimmie D. Petty and James N. Huckins and James L. Zajicek},
  year = {1993},
  doi = {10.1016/0045-6535(93)90143-s},
  url = {https://pubs.usgs.gov/publication/70177762},
  note = {Source identifier: 70177762}
}