Die Verwendung der Randlochkarte mit drei Lochreihen für das Gebiet der Geburtshilfe und Gyn?kologie

摘要

A three-hole exterior-punched card for the use of bibliographies in obstetrics and gynecology is explained. The first two holes (coded by letters and numerals) pertain to the subject of the article (e.g. B8, Physiology of the newborn) while the third hole represents special features of interest to the bibliographer (e.g. a, experimental findings; e, journal article). The system can also be used for patients' records and to study clinical problems.