Transport Canada website
The Transport Dangerous Goods Directorate (TDG) Homepage
â€œThe TDG Directorate serves as the major source of regulatory development, information and guidance on dangerous goods transport for the public, industry and government employees.â€�
International The Globally Harmonized System of Classification and Labelling of Chemicals (GHS) (note: this is not TDG - but related), The United Nations
"the Globally Harmonized System of Classification and Labelling of Chemicals (GHS), that is able to protect people from the mismanagement of chemicals, classify them according to their hazard and create a labelling system based on pictograms universally understandable, has been adopted in December 2002 in Geneva". This GHS system is now available for worldwide implementation.
The Globally Harmonized System for the Classification and Labelling (The GHS) - Implementation of the GHS in Canada, Health Canada