| http://www.w3.org/ns/prov#value | - This invention concerns a surfactant oil recovery method applicable to subterranean petroleum-containing formations having relatively high salinity water, e.g., water containing from about 40,000 to about 120,000 parts per million total dissolved solids, which may also have dissolved therein from 3,000 to 12,000 parts per million polyvalent ions such as calcium or magnesium, the formation temperat
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