O'Connor, Neil. Speech and thought in severe subnormality; an experimental study [by] N. O'Connor and Beate Hermelin. - Oxford, New York, Pergamon Press, 1963. - 122 p. illus. 22 cm. Includes bibliography. LCCN: 62021782 Nat. Bib. No.: GB63-4228 Subjects--Topical Terms: Children with mental disabilities. LC Class. No.: RJ506.M4 / O3 1963 Dewey Class. No.: 616.858 89 OCO H National Library of Medicine Call No.: WM300 / .O18s 1963