http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Manual for classification of gases, vapors and dusts for electrical equipment in hazardous (classified) locations
Classification of gases, vapors and dusts for electrical equipment in hazardous (classified) locations, 1983
Cover title: Classification of gases, vapors and dusts for electrical equipment in hazardous (classified) locations, 1983.