Correspondence, memoranda, minutes, drafts, reports, notes, subject files, production and publication material, project proposals, editorial and research material, promotional material, printed matter, and miscellaneous papers relating primarily to McGuire's career as an editor for the Bollingen Series, a publishing program to bring the writings of the Swiss analytical psychologist C.G. Jung and other works on comparative religion, myth, and literature to the English-speaking public. Includes materials relating to John C. Burnham, Joseph Campbell, Samuel Taylor Coleridge, Sigmund Freud, R.C.F. Hull, C. G. Jung, Ian MacPhail, Vladimir Vladimirovich Nabokov, Erich Neumann, Maud Oakes, Aleksandr Sergeevich Pushkin, Natacha Rambova, Max Raphael, Saint-John Perse, Miguel de Unamuno, Rudolph Valentino, Paul Valéry, and to the A.W. Mellon Lectures in the Fine Arts. Also includes material concerning McGuire's books Bollingen: An Adventure in Collecting the Past (1982) and Poetry's Catbird Seat : The Consultantship in Poetry in the English Language at the Library of Congress, 1937-1987(1988).

Correspondents include Gerhard Adler, Herbert Smith Bailey, John D. Barrett, Huntington Cairns, Joseph Campbell, K.R. Eissler, Anna Freud, Ernst L. Freud, Vaun Gillmor, R.F.C. Hull, Aniela Jaffé, C.G. Jung, Franz Jung, Hans Karrer, Dorothy Léger, Ralph Manheim, Mary Mellon, Paul Mellon, Vladimir Vladimirovich Nabokov, Kathleen Raine, and Wolfgang Sauerl and publishers Rascher Verlag, Routledge & Kegan Paul, and Walter Verlag.