Shaffer, E. A. Thomson, A. B. R FIRST principles of Gastroenterology: The basis of disease and an approach to management / [by] A. B. R. Thomson, E. A. Shaffer - 2nd ed. - Ontario Astra pharma 1994 - xiv, 587 p. Includes index. ISBN: 920163122 Subjects--Topical Terms: Gastroenterology Dewey Class. No.: 616.33 / FIR