296,823 PRECANCEROUS Precancerous lesions of the gastrointestinal tract : /International Symposium on Precancerous ... in October 1981, Bologna, Italy/ / Ed. Paul Sherlock /et al./ ; /contributors R. N. Allan et al./. - New York : Raven Press/1983/. - XII /1/, 330 s. : il., wykr. ; 26 cm ISBN 0-89004-883-5