@article{222812,
      recid = {222812},
      author = {Watson, John G.},
      title = {Guidance for network design and optimum site exposure for  PM₂.₅and PM₁₀ [microform] /},
      publisher = {U.S. Environmental Protection Agency, Office of Air  Quality Planning and Standards,},
      address = {Research Triangle Park, NC :},
      pages = {1 v.},
      year = {1997},
      note = {Shipping list no.: 99-0855-M.},
      url = {http://library.usi.edu/record/222812},
}