TY - GEN AU - Welch, Claude E. TI - Polypoid lesions of the gastrointestinal tract T2 - Major problems in clinical surgery PY - 1964/// CY - Philadelphia PB - W.B. Saunders Company KW - Lesões polipóides do trato gastrointestinal KW - DP 616.34 KW - v.2 KW - POL ER -