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Index—General

• Single index to the schedules
• Primarily Medical Subject Heading (MeSH) concepts used in cataloging
• Arranged in alphabetical order
• Includes NLM Classification numbers for medical concepts
• Includes LCC numbers for non-medical concepts (must be verified in LCC schedule)
• Not a substitute for the main schedules
• Many headings are assigned a range of numbers rather than a specific number
• Updated annually to reflect MeSH changes

Index—Relationship to MeSH

• All main index headings are MeSH
• All terms available in the MeSH thesaurus are not reflected in the Index
  • Index terms are included based on literary warrant reflected in the NLM collection
  • Supplementary concept records (SCRs) are not used in cataloging and are therefore excluded from the index
  • Very specific terms are generally excluded