I have had some luck in the past finding ancestors and other family members being researched in phone directories. In this case Gordon Kenneth Herring is found in the Tucson, Arizona City Directory of 1948. Also found is his wife, Evelyn I. Gordon is listed as involved in trucking. Gordon and Evelyn are listed as living at 3115 E. Greenlee Rd. Looking down a couple entries there is listed one M. M. Herring and his wife Bessie M. Herring at the same address. This is Gordon's parents Melvin Marion Herring and Bessie Margaret Dinklage.