Cataloging: Fundamentals of the NLM® Classification
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- Almost all serials at NLM are classified in the form number W1, rather than by topic
- Determination of what constitutes a serial follows the definition provided in the latest version of AACR2:
- "A continuing resource issued in a succession of discrete parts, usually bearing numbering, that has no predetermined conclusion. Examples of serials include journals, magazines, electronic journals, continuing directories, annual reports, newspapers and monographic series."