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Hi Eric I used an OCLC number match to get a sense of overlap at WFU - http://www.erikmitchell.info/2011/05/06/how-much-overlap-do-we-have-with-the-hathitrust/, http://www.erikmitchell.info/2011/05/07/more-on-hathitrust-overlap/. As I recall I simply pulled the oclc numbers from the MARC files (perhaps even just their spreadsheets) and did some simple database querying. More recently I have been working with the HT files using text similarity measures (e.g. pylevenshtein) to compare holdings across libraries. This takes a lot of CPU time but has proven to be a pretty good way to compare holdings at a title level and I suppose with a detailed enough text string (title, pub date, publisher...) you could focus the comparison on expressions/manifestations rather than just titles. Erik On Fri, Aug 3, 2012 at 11:15 AM, Jon Stroop <[log in to unmask]> wrote: > You can do an empty query in their catalog, and use the "Original Location" > facet to filter to a holding library. Programatically, I'm not sure, but > you'd probably need to use the Hathi files: > http://www.hathitrust.org/hathifiles. > > -Jon > > > On 08/03/2012 11:07 AM, Eric Lease Morgan wrote: >> >> If I needed/wanted to know what materials held by my library were also in >> the HaitTrust, then programmatically how could I figure this out? In other >> words, do you know of a way to query the HaitTrust and limit the results to >> items my library owns? --Eric Lease Morgan