Consists of the collection of Alexandros Xydēs, Greek diplomat and art critic. Included are typed manuscripts, correspondence, off-prints, ephemera, and other printed material with a focus on Greek politics, Cyprus, human rights, and international relations.

Consists of personal, professional, and academic papers of the Pueblo anthropologist Alfonso Ortiz (1939-1997), including correspondence, working files, and materials related to the Association on American Indian Affairs (AAIA).

Consists of autograph musical compositions, diaries, notebooks, and related material of Boswell, an American composer.

Alfred J. Lotka (1880-1949), a statistician for the Metropolitan Life Insurance Company, was a significant contributor to the field of demography. He was a pioneer in the study of population dynamics and conducted research on the mathematical theory of evolution and the mathematical analysis of populations. Lotka's papers document his scholarship and his involvement in professional organizations and include drafts of his works, his notes and research materials, and correspondence.

Consists chiefly of letters by Alfred Thayer Mahan to his publisher regarding his writings about United States naval history. Mahan was a U.S. naval officer in the Civil War, and his work on the importance of adequate navies and merchant marines influenced the policies and philosophies of national leaders across the globe, including those of the 26th president of the United States, Theodore Roosevelt.

Consists primarily of correspondence and printed material, along with two diaries from 1926, a matted postcard, a photogravure plate, and a piece of hair jewelry. These family papers primarily center on Alice Holden (née Cort), as the correspondence are letters between members of the Cort family, or letters to her from her children. The collection largely documents the relationships of the Holden and Cort families in New York state between the 19th and 20th centuries.

Consists of selected letters and photographs of authors, poets, and friends collected by Alice Davis Tibbetts, secretary, companion, and romantic partner of Edgar Lee Masters.

The Alice Raphael Collection of Faust Materials contains photographs and epherema relating to the Yale bicentennial of Goethe's Faust , for which Alice Raphael's translation was used, as well as information about other productions of Faust and about Raphael's other work.

Consists of papers and photographs of Alison Frantz (1903-1995), a classicist who was the photographer and specialist in Early Christian and Byzantine archaeology for the Agora excavations at Athens from 1933 to 1968 for the American School of Classical Studies.

Consists of the papers of Allan Marquand, Princeton art professor, founder of the University's Department of Art and Archaeology, and first director of its Art Museum.