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She joined the Library of Congress as a research assistant in the early 1970s and helped compile the National Union Catalog, a several-hundred-volume compendium of books held in U.S. and Canadian libraries.

If the record is not available, they create it in their own catalog and export it into the union catalog, for the new record to be instantly available to all catalogers of member libraries.

Location of items is indicated either by a Library of Congress call number or location symbol, or, for material in another library, by the National Union Catalog symbol for that library.

When catalogers of a member library catalog a new document, they first search the union catalog.

If the record is not available, they create it in their own library catalog and export it into the union catalog.