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As Kevin said, I think you can use the Atom feed to page backwards through time. Basically this amounts to programatically following the <link rel="next"> links in the feed, applying creates, updates and deletes as you go until you make it to Feb. 15, 2010. Currently this would involve walking from: http://id.loc.gov/authorities/feed/ to: http://id.loc.gov/authorities/feed/page/2/ all the way to: http://id.loc.gov/authorities/feed/page/96/ Then in a months time or whatever you can run the same process again. I think you can either walk through the feed pages until a known last harvest date, or until you see a record with an atom:id and atom:update you already know about. I think the latter could be a bit simpler, assuming you are keeping track of what you have. Ever since reading the OAI-ORE specs on Atom [1] I've become a bit taken with the idea of using Atom syndication as a drop in replacement for OAI-PMH--which is the spec that most people in the library community reach for when they want to do metadata synchronization. The advantage of Atom is that it fits into the syndication world so nicely, and its ecosystem of tools and services. //Ed [1] http://www.openarchives.org/ore/1.0/atom On Thu, May 13, 2010 at 4:53 PM, Kevin Ford <[log in to unmask]> wrote: > The short answer to your question is "no," there's no way to query terms based on last modification date. However, and this feature needs publication on the website, there is an Atom feed that exposes the change activities for the subject headings: > > http://id.loc.gov/authorities/feed/ > > You can page through it (feed/page/1, feed/page/2). > > There is also a page that shows when each load was performed: > > http://id.loc.gov/authorities/loads/ > > It too has an Atom feed (http://id.loc.gov/authorities/loads/feed). > > HTH, > Kevin