Keeping a library authority file up‐to‐date and therefore authoritative can be a cumbersome task even when the file is maintained in computer‐readable form. When, in addition, it becomes necessary to do massive updating to bring the entire file into conformity with a changed or newly‐adopted standard, the task becomes even more difficult. This paper describes an example of accomplishing such an update on the Chemical Abstracts Service Source Index (CASSI) using a relatively low level of human resources, and computer resources which had been placed in the library mainly for word‐processing. The same strategy was re‐used in a similar update of a related authority file. Perhaps this example will encourage others to undertake similar projects.
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