This series consists of letters to Wendell Wilcox from friends, family and colleagues, such as Alice B. Toklas, Gertrude Stein, and his wife, Esther Willson Wilcox.

This series contains clippings of short stories printed in magazines such as Harper's Bazaar, Mid-Western Review and The New Yorker, as well as some poetry books and short pieces written on other authors.

Contains masters of Edward T. Cone's published compositions, most done in pen on vellum, and working copies used for performance, revision, or correction.

Contains twelve binders of musical sketches, charts, and early manuscripts. Many items in the sketchbooks are bound upside-down, Cone's method for keeping different pieces separate.

Contains personal correspondence; material from the 1939 Princeton University commencement, at which Cone was salutatorian; poetry, including an unpublished poem written for Cone by John Berryman; two short plays by unknown writers; and clippings.

This series consists of the correspondence received by Mujica Láinez, as well as a few manuscripts by him, and several manuscripts by others. The series is arranged alphabetically. Included at the front of the series is a chronology of his career and life, written by his daughter (Ana Mujica) and daughter-in-law (Susana Rodríguez de Mujica Láinez). There is substantial correspondence from both Silvina and Victoria Ocampo; his close friend, and novelist Marta Lynch; his friend, and later, biographer, Oscar Hermes Villordo; as well as his Argentinian-Spanish friend Marcos Ricardo Barnatán, and his Spanish friends Guillermo Carnero and Luis Antonio de Villena. There is an undated, four-page letter to Mujica Láinez from Chilean poet Gabriela Mistral, written while she was staying in Buenos Aires. The series is notable for the range of dates which the correspondence spans, 1927 to 1984, and for its varied documents which portray the Argentinian literary scene, primarily in the decades of the 1940s-1970s.

Consists of family correspondence, divided into those of general family members and those of Manuel Mujica Láinez.

Consists of the poems, documents, and pictoral works of William Cowper.

This series consists of correspondence amongst Cowper's circle of family, friends, editors, and others, as well as a few assorted manuscripts. While the majority of the letters are original, there are also some copies. The primary correspondents include Sir John Carr, William Hayley, Lady Hesketh, John Johnson, John Newton, and Samuel Teedon. This series is first organized alphabetically by correspondent, then alphabetically by recipient, and finally chronologically by date. Unidentified manuscripts are located at the end of the series.