Series I: Correspondence, 1963 July 1-1992 December 9 consists primarily of letters that Byron de la Beckwith wrote to his wife, Mary Louise (Williams) Beckwith, while he was incarcerated in Mississippi before and during his first trial for the murder of Medgar Evers. Beckwith tells his wife that he is well treated (and indeed is granted numerous privileges not accorded to other inmates) and asks her to send him various items. He also expresses his conviction that he will be acquitted and mentions the strategies that his lawyers intend to pursue. A second group of correspondence was written between Beckwith and B. Reed Massengill while Massengill was working on a biography of Beckwith during the late 1980s and early 1990s. In these letters, Beckwith's Christian Identity principles are displayed prominently. He frequently rails against blacks and Jews, both of whom he believes are attempting to destroy American (and specifically white Christian) society, and encourages Massengill to learn the truth about such groups. Beckwith also enclosed leaflets, newspapers, and other items published by such organization as the Christian Defense League, Aryan Nations, and the Ku Klux Klan for Massengill's edification. The letters end in 1992, shortly after Beckwith decided to write his biography with another author, R. W. Scott. Scott eventually produced a work entitled Glory in Conflict (1990), while Massengill wrote Portrait of A Racist (1996).

Series II: Photographs, circa 1940-1986 January houses a collection of snapshots showing Byron de la Beckwith Sr., Byron de la Beckwith Jr., and Mary Louise (Williams) Beckwith. The earliest images show Mary Louise Williams shortly before her marriage to Beckwith, and the majority of the photographs depict the family before Byron and Willie Beckwith divorced for the third time in 1965. Beckwith inscribed a few of the images from the 1970s with captions describing the scene depicted and proclaiming his love for Willie, while the latest pictures show him with his second wife, Thelma Lindsay (Neff) Beckwith.

Series III: Oversize materials