This index covers issues 1 to 315, September 1955 to December 1989. It offers a combined subject and author index to the articles of one or more pages in correspondence, brief news items and short reviews of books have not been included. The index identifies articles by issue number and a full specification of pages; this will assist in obtaining photocopies of articles as the issues quickly go out of print. There have been a number of frequency and format changes so the following page relates issue numbers to date.