A total of 2,792 document titles published in a specialized subject bibliography entitled The Prostaglandins by the Upjohn Company, USA, was examined. There was a slight but significant increase in information content of the titles with time. Employing the Montgomery‐Swanson method, it was found that about 80 per cent of the papers had at least one ‘prostaglandin‐term’ in their titles. The data obtained in this study are compared with those obtained in earlier studies.
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