The Allied Mission to Observe Greek Elections was established when on September 19, 1945 the Governments of Britain, France, and the United States accepted the Greek Government's invitation to send observers for the general elections and plebiscite to be held in 1946. The collection consists of correspondence, circulars, memos, press extracts, and and maps, including one annotated map depicting the locations of headquarters among the country.

Consists of the records (1760-1974) of a large business conglomerate in northern Mexico founded by Pedro R. Prieto and owned by branches of the Prieto family, including Maíz family members, for three generations.

Consists of approximately 701 flat works from the collections of the Princeton University Art Museum, temporarily transferred to the Princeton University Library for use in Princeton University courses during the Spring 2023 semester.

Consists of several hundred print photographs (most are captioned) primarily from various French news outlets and agencies documenting people and events of numerous countries and geographic regions spanning the mid to late 20th century.

The papers comprise documents relating to all periods of the life of Kurt Gödel, foremost mathematical logician of the twentieth century, including scientific correspondence, notebooks, drafts, unpublished manuscripts, academic, legal, and financial records, and all manner of loose notes and memoranda.

Consists of research files, primarily government records, of scholar and author Jacques Roumani (1944-2016) on Libya during the period of Italian colonization.

Consists of 108 letters by Mencken to Dent Smith between the years 1938 and 1945, with Smith's side of the correspondence present in carbon copies.

Consists of a photograph album, loose photographs, and clippings belonging to Robert J. Sommers (1881-1972), primarily documenting his work as a highway engineer in Alaska in the late 1920s, as well as some materials related to his personal life and career as a civil engineer and businessman involved in construction. Of note is a photograph album documenting a tour of Alaska made in 1928 by Sommers with Governor George A. Parks and Major Malcolm Elliott.

George Hafstad was a plant pathologist and a field technician with the U.S. Rubber Development Corporation in Brazil from 1943 to 1945. The George E. Hafstad Papers include a diary, several technician reports, and a folder of photographs from Hafstad's time as a field technician with the U.S. Rubber Development Corporation Amazon Division.