Correspondence, memoranda, manuscripts, manuscript notes, typescripts, and printed materials. Most of the papers concern the bibliographical control of scientific literature with particular emphasis on the development of an information storage and retrieval system for the Olin Mathiessen Chemical Corporation Library. There are letters from librarians and scientists, Olin Mathiessen inter-office memoranda, Fessler's manuscripts, manuscript notes and typescripts, and supporting printed materials published by IBM. There are also mimeograph copies of papers by several other information scientists. Also, Fessler's file of approximately 200 typescripts of his book, record, and cassette reviews on a variety of fiction and non-fiction titles chiefly for LIBRARY JOURNAL. In addition there are some course-related materials for the library science classes Fessler taught at Southern Connecticut State College, 1961-1965, including one of his syllabi and some correspondence relating to education for special librarianship. The printed materials include several articles by Fessler and two items inscribed by colleagues to him.