Spraggett, Allen. The unexplained. Foreword by James A. Pike. - [New York] New American Library [1967] - xiii, 232 p. 21 cm. Bibliography: p. 231-232. LCCN: 67026236 //r83 Subjects--Topical Terms: Psychical research LC Class. No.: BF1031 / .S76 Dewey Class. No.: 133