http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Particulate measurement - evaluation of the equivalency of the three-bag and four-bag LA-4 dynamometer test procedures
Office of Mobile Source Air Pollution Control.
Standards Development and Support Branch,
1 online resource (3, 1 unnumbered page) : illustrations