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==Bibliography==
==Bibliography==
''The Handbook of Texas'' uses these sources for its biographical sketch of Twichell:
''The Handbook of Texas'' uses these sources for its biographical sketch of Twichell:<br>
*Alice Duggan Gracy, "Willis Twichell, Civil Engineer." Gracy was the daughter of a short-term Texas state senator, Arthur Pope Duggan, Sr. (1876-1935), an [[attorney]] and [[real estate]] developer from Stamford, Texas, who was married to a niece of George Washington Littlefield.<ref>{{cite web|url=https://legacy.lib.utexas.edu/taro/ttusw/00018/tsw-00018.html|title=Alice Duggan Gracy: An Inventory of Her Papers, 1910-1951|publisher=Southwest Collection/Special Collections Library in [[Lubbock]]|accessdate=October 14, 2019}}</ref>
*Alice Duggan Gracy, "Willis Twichell, Civil Engineer." Gracy was the daughter of a short-term Texas state senator, Arthur Pope Duggan, Sr. (1876-1935), an [[attorney]] and [[real estate]] developer from Stamford, Texas, who was married to a niece of George Washington Littlefield.<ref>{{cite web|url=https://legacy.lib.utexas.edu/taro/ttusw/00018/tsw-00018.html|title=Alice Duggan Gracy: An Inventory of Her Papers, 1910-1951|publisher=Southwest Collection/Special Collections Library in [[Lubbock]]|accessdate=October 14, 2019}}</ref>
* Sue Watkins, ed., ''One League to Each Wind: Accounts of Early Surveying in Texas'' (Austin: Surveyors Association Historical Committee, c. 1964). name=handbook/>
* Sue Watkins, ed., ''One League to Each Wind: Accounts of Early Surveying in Texas'' (Austin: Surveyors Association Historical Committee, c. 1964). name=handbook/>
==References==
==References==
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