The PERC website is a great resource to utilize for general propane information, safety & training in the workplace, and links to other helpful websites in the industry. 

The Material Safety Data Sheet (MSDS) explains the chemical makeup of propane, as well as the personal protective measures to take when handling or disposing propane and the steps to take in case of accidental exposure on the job. 

The Safety Manual has some great information that gives facts and safety information about propane, what precautions to take in emergency situations, as well as how the propane system works.