Johnson, N. L. Statistics : an intermediate text book / N. L. Johnson & H. Tetley - Cambridge : Published for the Institute of Actuaries and the Faculty of Actuaries at the University Press , 1950 - 2 vols. : ill. ; 19 cm. Includes bibliographical references and index. Subjects--Topical Terms: Statistics Dewey Class. No.: 311 / JOH-2