This directory offers two primary access methods for locating periodicals in Volume 1-4: by subject in the CLASSIFIED LIST OF SERIALS, and alphabetically in the TITLE INDEX. Ceased serials are listed in a separate CESSATIONS section and are also acceddible by means of the TITLE INDEX. Other indexes provide listings of selected periodicals in specific categories. These indexes are REFEREED SERIALS, CONTROLLED CIRCULATION SERIALS, SERIALS AVAILABRE ON CD-ROM, PRODUCER LISTING/SERIALS ONCD-ROM, SERIALS AVAILABLE ONLINE, VENDOR LISTING/SERIALS ONMLINE, PUBLICATIONS OF INTERNATIONAL ORGANIZATIONS, ISSN INDEX, and TITLE CHANGE INDEX. See the User's Guide in Volume 5 for a content description and use instructions for the NEWSPAPER volume. In addition, separate subheadings for "Abstracting, Bibliographies and Statistics" under major subject headings provide convenient access to these types of publications. Page references for these dubheadings are given in the "Subject Guide to Abstracting and Indexing" on p.xliv. This Subject Guide provides an overview of subjects for which abstracting and indexing publications have been identified. This "User's Guide" is separated into three divisions for ease of use: (I) Section Descriptions, (II) Full Entry Content Description, and (III) Cataloging Rules for main Entry Title.