Propane 07 : A liquid petroleum gas (LPG) alternative fuel which is stored under moderate pressure and with vapor heavier than air; produced as a by-product of natural gas and oil production
Ilan Kelman (ed.), Vulnerability and Resilience Definitions and References, Version 2, 2007. http://www.islandvulnerability.org/docs/vulnres.pd f, (Vulnr and Resilience - Brit) {524}