Consists of newspaper and magazine clippings, photocopies of articles, printed materials, ephemera, and scrapbooks that McCarthy kept as source material for his work, as well as to track the reception of his activities and those of other Irish poets in the press. While similar materials that McCarthy interfiled with his poetry drafts can be found in the Writings file group, materials described here consist of those that were not already filed or readily associated with a specific writing project. Many of the clippings McCarthy kept pertain to Irish history, government, culture, and literature. There are some magazines in which McCarthy's writings appeared, translations of his works, and writings by others about McCarthy and other topics, including some materials he may have used for teaching purposes. Of note are a small number of photographs depicting McCarthy, including with family and friends, largely from the 1980s through the 2000s.

Consists of publicity materials, ephemera, and audio and video recordings related to various literary and cultural events in which McCarthy participated, as well as transcripts, printed materials, and recordings of interviews.

Consists of teaching materials for poetry workshops and literary courses McCarthy taught, including a 1986 workshop at the Mayfield Library, a workshop for children, and miscellaneous course readings and notes.

This series consists of unprocessed additional, including binders of notes relating to a myriad of topics (such as math, navigation, population, and social physics) (1931-1971), correspondence (1920-1972), and miscellaneous files covering Stewarts eclectic fields of interest. This series is roughly organized by material type (binders, reprints, correspondence, and other materials).

Consists of more articles and scientific papers by Eugene Paul Wigner, several photographs, works about Eugene Paul Wigner, honors, invitations, speeches, and biographical material.

This series includes David Lewis's extensive correspondence with fellow philosophers and scholars spanning over four decades. Frequent correspondents include philosophers such as David M. Armstrong, J. J. C. Smart, Frank Jackson, W. V. Quine, D. H. Mellor, M. J. Cresswell, Allen Hazen, John Bigelow, and others. Lewis's letters and the responses he received are often lengthy, as he maintained ongoing conversations regarding many philosophical topics with his colleagues through regular correspondence. Files include correspondence David Lewis filed and kept himself, as well as copies and originals of letters he sent to others that were later retrieved from his correspondents by Stephanie R. Lewis. Incoming and outgoing correspondence are filed together in keeping with the organization of the materials as they arrived at the library. Correspondence directly related to publishing and permissions for specific works by Lewis can be found in Series 2: Writings.

This series includes drafts at various stages of completion, notes, and outlines of David Lewis's articles, books, and reviews, as well as for his unpublished and posthumously published writings. Draft materials for Lewis's published works are also frequently accompanied by marked copies of books, reprints, and related publishing correspondence, including some correspondence (often in the form of email printouts) pertaining to permissions managed by Stephanie Lewis following David Lewis's death. Course notes, papers, and autobiographical writings from Lewis's student years are also present, as are research and reports written during his time at the Hudson Institute in the 1960s. Researchers should note that published works are listed under their most recent titles, though files may also contain earlier versions of works with variant titles.

This series includes additional administrative and academic papers of David Lewis, papers of Stephanie Lewis, family papers, photographs, born-digital files, audiovisual media, and other materials added to the collection following the death of Stephanie Lewis in November 2019. Born-digital files were extracted from optical media and USB drives and contain writings, research, correspondence, and photographs of both David and Stephanie Lewis.

These papers consists of unprocessed/minimally processed additions acquired since May 1997. Included are correspondence; manuscripts of poetry, articles, speeches, etc.; galley proofs of nonfiction works; notebooks; contracts; photographs; audio and visual tapes; scrapbooks; and other materials.