1. Dockerty, M. B.: Personal communication to the authors.
2. Earle, S. T.: Diseases of the Anus, Rectum, and Sigmoid. Philadelphia, J. B. Lippincott Company, 1911, 351 pp.
3. Enterline, H. T., G. W. Evans, R. Mercado-Lugo, L. Miller and W. T. Fitts, Jr.: Malignant potential of adenomas of colon and rectum. J.A.M.A.179: 322, 1962.
4. Pagtalunan, R. J., M. B. Dockerty, R. J. Jackman and M. J. Anderson, Jr.: The histopathology of diminutive polyps of the large intestine. Surg., Gynec. & Obst.120: 1259, 1965.
5. Spratt, J. S., Jr., L. V. Ackerman and C. A. Moyer: Relationship of polyps of the colon to colonic cancer. Ann. Surg.148: 682, 1958.