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Not a naive idea at all. If you have the stomach for it, you could extract the Subject Heading / Dewey combinations out of say the LC Catalog MARC data [1] to use as training data for some kind of clustering [2] algorithm. You might even be able to do something simple like keep a count of the Dewey ranges associated with each subject heading. I’m kind of curious myself, so I could work on getting the subject heading / dewey combinations if you want? //Ed [1] https://archive.org/details/marc_records_scriblio_net [2] https://en.wikipedia.org/wiki/Cluster_analysis On Dec 10, 2013, at 8:18 AM, Irina Arndt <[log in to unmask]> wrote: > Hi CODE4LIB, > > we would like to add DDC classes to a bunch of MARC records, which contains only LoC Subject Headings. > Does anybody know, if a mapping between LCSH and DDC is anywhere existent (and available)? > > I understood, that WebDewey http://www.oclc.org/dewey/versions/webdewey.en.html might provide such a service, but > > · we are no OCLC customers or subscribers to WebDewey > > · even if we were, I'm not sure, if the service matches our needs > > I'm thinking of a tool, where I can upload my list of subject headings and get back a list, where the matching Dewey classes have been added (but a 'simple' csv file with LCSH terms and DDC classes would be helpful as well- I am fully aware, that neither LCSH nor DDC are simple at all...) . Naïve idea...? > > Thanks for any clues, > Irina > > > ------- > > Irina Arndt > Max Planck Digital Library (MPDL) > Library System Coordinator > Amalienstr. 33 > D-80799 Muenchen, Germany > > Tel. +49 89 38602-254 > Fax +49 89 38602-290 > > Email: [log in to unmask]<mailto:[log in to unmask]> > http://www.mpdl.mpg.de