Industry links for your reference:
- National Propane Gas Association (npga.org)
- Propane Education & Research Council (PERC) marketing material
- PERC training material
- National Fire Protection Agency (nfpa.org)
- Compressed Gas Association (cganet.com)
- World LP Gas Association (wlpga.org)
- LP Gas Magazine (lpgasmagazine.com)
- Butane-Propane News (pbnews.com)
- Fuel Oil News (fueloilnews.com)