@misc{1179571,
  author = {Robert A Fletcher and David S Bright},
  title = {NBS portable ambient particulate sampler:},
  year = {1983},
  month = {1983-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.82-2561},
  language = {en},
}