Northwestern Mutual Life : a century of trusteeship / Harold F. Williamson and Orange A. Smalley. Illustrated by John Faragasso. Williamson, Harold Francis. 1901- Smalley, Orange A., joint author. Northwestern Mutual Life Insurance Company. 368.3 WIN Bibliography: p. 319-321. Evanston, Ill. : Northwestern University Press, 1957. 1957. 1957 Text 368 p. : eng Northwestern University studies in business history, v. 4