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Cataloging: Fundamentals of the NLM® Classification

Page 3 of 6

Audio-Visual Materials

  • All audiovisuals shelved in Reference or in the History of Medicine Division are assigned NLM classification numbers
  • The audiovisuals are then shelved together by class number and media code
    • The media code is determined by looking at $h of the 245 field and $a of the 300 field and selecting the appropriate value from the following table
FormatCode
Activity Card ACT
Electronic Resource
  • CD-ROM
  • Computer disk
  • DVD-ROM
Choose a code from the list below
  • CDR
  • CA
  • DVD
Interactive Multimedia IM
Kit KT
Motion Picture (16 mm) MP16
Radiograph PI
Slides SL
Slides and sound cassette SC
Sound Recording
  • Compact Disc
  • Sound cassette
Choose a code from the list below
  • CD
  • AC
Videodisc VDR
Videocassette VC


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