The bulk of the collection is letterbooks (1880-1901), dealing primarily (after 1883) with the affairs of the Thatcher Brothers Banking Company; also includes materials concerning the L.D.S. Church in Cache Valley, the Logan L.D.S. Temple, the Utah and Northern Railroad, Logan City Government, and the Democratic Party. Personal materials include correspondence with plural wife, Fanny, and son, George, and provide information on the inner workings of the institution of plural marriage. The miscellaneous papers are largely of a financial nature, and include papers of Noble Warrum, R.W. Sloan, Edward E.H. Holden, and several mining companies. Also includes class notes and missionary journal of George W. Thatcher Jr. promoting the Young Men's Mutual Improvement Association (YMMIA) in southern Utah and commonplace book of Jean C. Thatcher.; Arranged by type of material.; Biographical Note; Letterbooks of G. W. Thatcher, Sr.; Letterbook,; Letterbook,; Letterbook,; Letterbook,; Letterbook,; Papers concerning G. W. Thatcher, Jr. and J. C. Thatcher; Diary, George W. Thatcher, Jr.'s missionary labors in southern Utah,; Class notes, from G. W. Thatcher, Jr.'s studies at the University of Deseret,; Jean C. Thatcher's "Commonplace Book", contains notes, essays, quotes, etc.,; Jean C. Thatcher's "Record", contains notes on the study, instruction, and performance of music,; Papers of G. W. Thatcher, Sr.; Thatcher's LDS Church papers,; Papers concerning the Brigham Young College,; Thatcher-Preston burial plot,; Hezekiah Thatcher estate settlement papers,; George W. Thatcher, Sr. estate settlement papers,; Thatcher Milling Company papers,; Cache Pressed Brick Company stock certificates,; Rich-Cache Mining Company stock certificates and papers,; Sundown & LaPlata Mining Company stock certificates and papers,; Ima Consolidated Mining & Milling Company stock certificates,; E. & F. Mining Company stock certificates and correspondence,; Stock certificates, miscellaneous,; Insurance policy papers,; Deeds,; Deeds,; Salt Lake City land papers,; Deeds concerning Luna Y. Thatcher,; Nelly M. Blair financial papers,; Papers concerning Noble Warrum,; Papers and correspondence concerning R. W. Sloan,; Papers and correspondence concerning Edward H. Holden (Thatcher's nephew),; Papers and correspondence concerning Andrew Brixen,; Mortgage papers,; Releases of mortgages,; Miscellaneous financial papers,; Miscellaneous correspondence,; Extract of Logan City Council minutes,; (one item concerns The Logan Journal).
