Holliday's 2nd wife, Belinda Vidor Jones, was daughter of director King Vidor.
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Holliday wrote a masterly history of the California Gold Rush that capped three decades of painstaking research on the era.
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He is portrayed in the 1940 movie "Santa Fe Trail" by Henry O'Neill as a promoter of commerce and development in the American West of his time.
Holliday was elected as a Republican to the Fifty-seventh and to the three succeeding Congresses (March 4, 1901-March 3, 1909).
Research with B.B. Huckell was also carried out at several Folsom sites on the West Mesa area of the Albuquerque Basin.
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:In Sonora, field work in collaboration with M.G.Sanchez (INAH) focused on a series of Clovis sites, most prominently an in-situ Clovis/Gomphothere kill site and an extensive camping area on the adjacent uplands.
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During his time at Texas Tech University Holliday worked closely with Dr. Eileen Johnson of the Museum of Texas Tech University on the Lubbock Lake Project located in northwestern Texas.