All the various sets of regulations are based upon "Recommendations on the transport of Dangerous Goods - Model Regulations", known as "The Orange Book," issued by the United Nations Committee of Experts on the Transportation of Dangerous Goods and the Globally Harmonized System of Classification and Labeling.
Regulations covering different aspects are grounded in "Recommendations on the transportation of hazardous substances - Model Regulations," referred to as "The Orange Book," published by the United Nations Committee of Experts on the Transportation of Hazardous Substances and the Globally Harmonized System of Classification and Labeling.