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.

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 Of note are Eugene Bird's notes and other writings related to an unpublished biography of the diplomat George Antonius.

These records are composed of mostly correspondence and subject files that were created in the course of Ullman's work as an academic, primarily at Princeton University, and in various other positions he held during his career, such as his term on the editorial board of The New York Times. The records also include some of Ullman's published articles and what appear to be notes and research prepared for lectures on European governments and foreign policies. Of note is Ullman's correspondence with well-known individuals in the field of foreign policy, particularly George Kennan.

This portion of the collection includes correspondence, reviews, and research materials that pertain to Ullman's first published scholarly work, the three-volume Anglo-Soviet Relations, 1917-1971.