The papers of Jacob McGavock Dickinson, numbering approximately 40,200 items and 67 volumes, contain correspondence, speeches, diary material, briefs, sketches, reports, records of his Arkansas plantation, biographical and genealogical data, scrapbooks, photographs, clippings, and personal memorabilia dating from 1812 to 1946. The bulk of the material falls in the period 1909 to 1911 when he served as Secretary of War in William Howard Taft’s Cabinet. The date 1812 of a letter of Judge Dickinson’s grandfather, Jacob McGavock, to his father, Hugh McGavock, is the earliest found in the collection. There are 18 letterbooks of Judge Dickinson for the years 1904-1911. Seven volumes contain diary material kept for the Secretary of War while on his trip around the world in 1910. The genealogical and biographical data contain deeds, wills, early letters, sketches, and accounts of the Carr, Claiborne, Dickinson, Grundy, Maxwell, Overton, Waller, and kindred families.