Physics keeps changing and so do classification and subject indexing. Arthur Smith recalls the final updates to the Physics and Astronomy Classification Scheme (PACS) and the development of the Physics Subject Headings (PhySH), and ponders future directions.
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Smith, A. From PACS to PhySH. Nat Rev Phys 1, 8–11 (2019). https://doi.org/10.1038/s42254-018-0004-4
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DOI: https://doi.org/10.1038/s42254-018-0004-4
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