Can I prevail upon some kind person who has access to JAMA 1934 to check this reference for me? The volume number is missing: *Thoms H. 1934a, 'Clinical Significance of Roentgenometry in Obstetrics', Journal of the American Medical Association, ??? 602-3. Thanks a million in advance! Catherine Ebenezer Information Systems Manager Royal College of Midwives [log in to unmask] 020 7291 9213