Depends on what catalog system your local library is using. Many use the open source Evergreen ILS. It has a very robust API that I've used quite a bit for discovery.
There are some others, just one example.
Point being though is that every library system is different.
I'm pretty sure that is a more recent development, and that at least the Soviet Union and China weren't observers during the cold war. (But I haven't looked it up.)
There are some others, just one example.
Point being though is that every library system is different.
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