| http://www.w3.org/ns/prov#value | - I googled where does propane come from and here is one of the first things that came up, pasted:One of propane's unique features is that it is not produced for its own sake, but is a by-product of two other processes: natural gas processing and petroleum refining.Natural gas plant production of propane primarily involves extracting materials, such as propane and butane, from natural gas to preve
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