<unk>  are any substance or article, including a device, which is designed to function by explosion or which, by chemical reaction within itself is able to function in a similar manner even if not designed to function by explosion (unless the article is otherwise classed under a provision of 49CFR).
HAZMAT Class 1 Explosives
HAZMAT Class 3 Flammable Liquids
HAZMAT Class 4 Flammable Solids
Toxic Adenoma classification
ICD-9-CM Volume 3
Farmer's lung epidemiology and demographics
Large cell carcinoma of the lung classification
ICD-10 Chapter F