Literary manuscripts, correspondence, photographs and related materials documenting the professional career of Thomas Flanagan, Irish-American novelist and professor of English. The collection also includes a small amount of personal material. Literary materials include research notes, manuscript drafts, typescripts, proofs, clippings, reviews and correspondence related to Flanagan's published books: The Irish Novelists, 1800-1850 (1959), The Year of the French (1979), The Tenants of Time (1988), and The End of the Hunt (1994). Manuscripts and typescripts of his published non-fiction articles, reviews, speeches and lectures, as well as his earlier and later fiction and non-fiction writing, are included also. Correspondence includes letters to and from Richard Bridgeman, William Chase, Richard Elman, Seamus Heaney, Ben Kiely, Conor Cruise O'Brien, Darcy O'Brien, Kevin Sullivan and others.

This collection is organized into twenty-three series:

• Professional Correspondence, 1947-2001 and n.d.
• Professional Affairs, 1946-2002 and n.d.
• Personal Correspondence, 1921-2001
• Personal Affairs, 1905-1998
• Amherst College, 1979-2000
• Photographs, ca. 1930-1994
• Non-Fiction Writing: Articles, Reviews, Speeches, Lectures, 1956-2002
• The Irish Novelists, 1800-1850, 1958-1960
• The Year of the French, 1974-1982 (bulk 1979)
• The Tenants of Time, 1979-1992 (bulk 1986-1988)
• The End of the Hunt, 1989-1997 (bulk 1994)
• Other Fiction Writing, 1951-1966 and n.d.
• Notebooks, 1953-1983 and n.d.
• Calendars, 1980-2002
• Appointment books, 1983-1995 and n.d.
• Teaching Materials, 1951-1988
• Research Materials, 1866-1998 (bulk 1971-1995)
• Maps, 1988 and n.d.
• Video and Audio Recordings, ca. 1990-1998 and n.d.
• Objects, 1986-1994 and n.d.
• Writings by Others, 1882-2001 (bulk 1961-2001)
• Miscellaneous Printed Matter, 1953-1997 and n.d.
• Restricted Materials, 1970-1995