摘要：S UPPLEMENTS to medical periodicals generally fall into one of the following categories: monographs, reports of congresses or conferences, or heterogeneous groups of scientific papers. Their volume is great and is growing. This study stems from the problems of bibliographic control of supplements. The majority of these publications are of a variety commonly thought of as "book materials." Traditionally the identification of such materials is made through bibliographies of books and, in libraries, through the card catalog. Due to the nature of their publication, however, and the method by which they are usually cited and indexed, these supplements have the characteristics of periodical articles. Hence, a dilemma: shall they be treated as monographs or as periodical articles?
