WALKER J.J. 300.532 BRITISH 28th British Congress of Obstetrics and Gynaecology Harrogate , UK 30 June-3 July 1998 : book of abstracts / Royal College of Obstetricians and Gynaecologists president: Sir Naren Patel ; Congress Org. Comm. chairman: J. Drife ; Sci. Progr. chairman: J.J. Walker ; org. by the Leeds Obstetricians and Gynaecologicists. -