Travel to U.S.: West: Pioneer Oil Fields of the San Joaquin Valley: Photo 17 Late in the 60s, secondary recovery techniques were introduced to Kern County. Thousands of pumps went to work extracting heavy oil made less viscous by downhole pumping of hot steam. View: tiny * small * medium * big * biggest Photo Size Back to U.S.: West: Pioneer Oil Fields of the San Joaquin Valley chapter Short link for this page: http://www.greatmirror.com?justpic=5265

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