Correspondence, manuscripts, documents, photographs, memorabilia and printed materials of John Mitchel, John Purroy Mitchel, and other members of the Mitchel and Purroy families. The collection concerns Irish nationalism, family matters, Purroy family business interests in Central America, the John Purroy Mitchel Memorial and William Brown Meloney's files relating to his research and writing of "The Story of John Purroy Mitchel" along with the manuscript and typescript drafts for this unpublished biography.