TY  - BOOK
AU  - Cotton, Peter B
AU  - Cotton, Peter B
AU  - Williams, Christopher B
TI  - Practical gastrointestinal endoscopy
SN  - 0632027061
U1  - 616.33 
PY  - 1990///
CY  - London
PB  - Blackwell Scientific
KW  - Gastroenterology
ER  -