Félix Candela was an influential Spanish-born architect and structural engineer, known for his innovative designs using reinforced thin-shell concrete to create the highly efficient hyperbolic parabaloid shapes used in his construction of many well-known churches, factories, and other buildings, primarily in and around Mexico City in the mid-20th century. The collection consists of professional and personal papers, including photographic files documenting his projects, architectural drawings and designs, drafts of lectures and published papers, correspondence, appointment books, student notebooks and artwork, personal photographs and albums, awards and certificates, architectural reference books and magazines, construction materials catalogs, and clippings on various architecture and design topics and on Candela's own work.

Consists of a group of family photographs, ephemera, and other papers belonging to the Flores and Viramontes families, two interconnected Mexican American families living in southwest Texas and New Mexico in the 20th century.

Contains seven bound volumes of transcripts of Floyd H. Black's papers, including an unpublished autobiography, diaries, and correspondence.

Consists, for the most part, of letters received by American physician and collector F. L. Pleadwell and his wife, the former Laura Mell Stith, concerning Pleadwell's collection of autographs and books in the literary and historical fields, but includes an album of letters and other items collected from prominent associates in the medical field.

Author Victoria Ocampo (1890-1979) was founder (1931) and editor of the magazine SUR, an important literary magazine published in Buenos Aires. The collection consists primarily of Ocampo family correspondence, particularly that of the sisters Victoria and Angelica Ocampo.

Frances de Chollet (1900-1994) assisted Allen Dulles with obtaining the diaries of Galeazzo Ciano, the Foreign Minister of Italy from 1936-1943, from Ciano's wife, Edda, who was also the daughter of Benito Mussolini. The collection is mostly composed of correspondence written to Frances de Chollet from Edda Ciano, though letters from Allen Dulles and other correspondents are included to a lesser extent. The collection also contains a small amount of de Chollet's notes documenting her face-to-face meetings with Edda Ciano.

Francis Catlin was a member of the Princeton University Class of 1947. The collection contains materials distributed at the 1947 Bicentennial Convocation celebrating Princeton University's 200th anniversary.

Consists of papers of Scott relating, for the most part, to his positions as chairman of the General Munitions Board during World War I, co-founder and chairman of the War Industries Board (1917), chief of the Cleveland Ordnance District (1924-1928), and adviser to the Army Industrial College (1925).

Consists primarily of correspondence of the American educator, art critic, and museum director Frank Jewett Mather (1868-1953).

This collection contains the musical manuscripts, musical sketches, correspondence, teaching materials, business files, and other personal papers of American composer Frank Lewin (1925-2008), who resided in Princeton from 1951 until his death. Audio and video recordings on optical media and a hard drive include music, films, and interviews; digital materials also include photographs, documents, production information, scores, parts, copyright forms, and contracts.