The Biographical series contains materials regarding Baker's career and life and includes articles, interviews and oral histories, his diaries, awards and appointments, family correspondence, photographs, and weekly schedules for his retirement years. The articles include papers written by and about Baker regarding his life, as well as materials collected by A. Michael Noll on three CDs. The earlier diaries include references to his research at Bell Labs, while diaries beginning in the 1950s are predominantly concerned with his daily life. The awards and appointments materials include awards certificates, correspondence about accepted the awards and congratulations, his acceptance speeches, programs, and articles. Most awards are from academic and professional organizations or corporations for his contributions to science, from government agencies for his service, and honorary degrees from universities. The photographs include portraits of Baker, Baker receiving awards, at events, or with members of boards he served on, and personal photographs of unidentified people and landscapes. The weekly schedules record meetings and events that Baker attended, and also include correspondence about the events, itineraries, and expenses.

The letters in Series 1: Correspondence are primarily personal in nature, though some business correspondence is also included. Most of the correspondence dates from the Birds' time living in the Middle East and India in the 1960s and 1970s, though there are also letters that predate and postdate Eugene's tenure with the Foreign Service. In addition to the Birds' outgoing letters describing their lives to family and friends, the series also contains a large portion of letters that the Birds received from their children and from other Foreign Service families.

The documents in Series 2: Saudi Arabian Women Projects mostly relate to Jerine Bird's unpublished manuscript on the changing roles of Saudi Arabian women, alternatively titled either "The Wall and the Veil" or "Beyond the Wall." The series contains multiple drafts and outlines of the book's chapters, as well as the notes and research materials that Jerine Bird consulted, including interviews that she conducted with Saudi Arabian women in the early 1980s. To a lesser extent, this series includes materials related to a workshop on Saudi Arabian women and society that Jerine Bird developed and taught at Georgetown University around 1983-1984.

Series 3: Subject Files contains notes, reports, correspondence, news clippings, and other materials. Though the bulk of the series pertains to Saudi Arabia or the Middle East more generally, there are also materials on India and some biographical information on Eugene and Jerine Bird.

Series 4: Writings includes the Birds' articles, poetry, speeches, and other writings on the Middle East and various topics. Most of the series is composed of Eugene Bird's writings; the majority of Jerine Bird's writings may be found in Series 2: Saudi Arabian Women Projects. Of note are Eugene Bird's notes and other writings related to an unpublished biography of the diplomat George Antonius.