This three-box collection contains the papers of George W. Thatcher, Sr. spanning the period of 1872 to 1917. This collection is comprised of seven volumes and loose papers consisting of George's correspondence, legal papers, financial papers, and papers relating to Thatcher's children, George W. Thatcher, Jr. and Jean C. Thatcher. The bulk of this collection consists of George's outgoing correspondence in the form of his letterbooks.

Books 1-5 consist of George's five letterbooks which contain nearly 2,700 pages of his outgoing correspondence spanning the period from 1880 to 1901. His correspondence discusses his business ventures, railroading, banking, political activities, family life, Mormonism, polygamy, his brother Moses Thatcher, Sr.'s 1896 expulsion from the Quorum of the Twelve Apostles, and other topics. Book 6, George W. Thatcher, Jr.'s 1891 diary, was written during a missionary trip through southern Utah with the Church of Jesus Christ of Latter-day Saints' YMMIA program. Book 7 consists of notes taken by George W. Thatcher, Jr. during his studies at the University of Deseret in 1885. Books 8 and 9 consist of Jean C. Thatcher's notes on music and her "Commonplace Book," which records quotes, essays, and other personal notes. box 3 contains correspondence, financial papers, legal papers, and other material connected to George W. Thatcher, Sr.