Hi and welcome.
Hi, I am a Wikimedian who is trying to add authority control IDs on Wikidata for notable authors and titles. is there any documentation for looking up LCCNs and/or OCLC IDs for a long list of book titles? Similarly, I also want to search for individuals author/translator/editors' LCNAFs. Library of Congress has an API endpoint such as below, as documented at APIs for LoC.gov | Library of Congress.
"https://www.id.loc.gov/search/?all=True&fo=json&q=Book+Title&st=list"
OpenRefine has a general interface to what it calls "reconciliation services" for doing this type of work. You can find a note about LCNAF reconciliation services here:
https://forum.openrefine.org/t/how-to-reconcile-with-library-of-congress-authorities/589
Hope that helps!
Tom