This collection mainly consists of the research and writings for Harper’s dissertation and published volume. The subject of both these projects was the relationship of Cardinal John Henry Newman and the scientist, William Froude, during the period when Newman's influence resulted in the conversion to Catholicism of Froude's wife and children (1845-1864). Included in the collection are typescript chapters from Harper's dissertation, "The Froude Family in the Oxford Movement," and typescript of letters from the correspondence of Newman and Froude. Other items are proofs from the published volume, Cardinal Newman and William Froude, F.R.S., reviews, articles, and notes used for further research. Correspondence includes letters of the publisher and several congratulatory messages from colleagues and family. A small group of personal items completes the collection. Among the personal items are travel documents, receipts, commencement programs, a clipping describing John Harper's impressions of Germany in 1921, and letters of appointment to the Department of English at Hopkins (1932-1933). Harpers diplomas from Princeton (1927) and Hopkins (1932) are also present.