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Usually, important catalogs are accessed for copy-cataloguing whole records. It is possible to retrieve "atomic" information too, using unique keys like ISBN.
Library at Pontificia Università della S. Croce developed a tool that allows Dewey retrieval and insertion into bibliographic records, in bulk mode as well as in single record mode, i.e. during cataloguing.
During the bulk process, Dewey classification was added to about 20,000 records, retrieving it from OCLC, Library of Congress and some national libraries, up to 7 external sources.
The single record mode was integrated into the Koha ILS, to make easier to assign Dewey classification during cataloguing.