| http://www.w3.org/ns/prov#value | - In order to commence retorting of the rubblized mass 18 of oil shale, a liquid or gaseous fuel, preferably a combustible ignition gas or fuel gas, such as recycled off gases or natural gas, is fed into the retort through fuel line 30, and an oxygen-containing, flame front-supporting, feed gas consisting essentially of air and steam is fed into the retort through feed gas line 32.
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