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Library of Congress Subject Areas (47864)
- A General Works (255)
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- B Philosophy. Psychology. Religion (4924)
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- M Music and Books on Music (235)
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- N Fine Arts (2378)
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- P Language and Literature (4205)
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- Q Science (13654)
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      - QA76.17 History of computing (4)
      - QA76.575 Multimedia systems (25)
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        QA76.76.I59 Interactive media, hypermedia (24)
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      - QA76.87 Neural computers, neural networks (63)
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- R Medicine (2785)
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      - R729.5.G4 General practice (42)
    - R857.O6 Optical coherence tomography (250)
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  - RA Public aspects of medicine (683)
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    - RJ506.A9 Autism. Infantile autism. Asperger's syndrome (2)
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