Escalante with a full tour, you could survive most anything. See also Utah Parks Company Service Station References Bibliography External links Gerald R. Sherratt Library The Development of Zion National Park Utah Parks Company Records;MSS 533; Utah Parks Company records; 20th Century Western & Mormon Manuscripts; L. Tom Perry Special Collections, Harold B. Lee Library, Brigham Young University. Union Pacific Railroad Companies based in Utah 1923 establishments in Utah