Hi, This is the REST URL I use to pull out Western genre books, that are books, written in English. Using +and+srw.la+all+%22eng%22 to pull out English Language items. http://www.worldcat.org/webservices/catalog/search/worldcat/sru?query=srw.su+all+%22westerns%22+and+srw.mt+all+%22bks%22+and+srw.la+all+%22eng%22 Hope this helps. Brent Ferguson, MLS Librarian, Elkhart Public Library Elkhart, IN (574) 274-7445 ________________________________________ From: Code for Libraries [[log in to unmask]] on behalf of Kun Lin [[log in to unmask]] Sent: Monday, February 11, 2019 12:43 PM To: [log in to unmask] Subject: [CODE4LIB] Worldcat Search API Anyone is using WorldCat Search API? I can't find a way to restrict return results to English cataloged item (040 b). And there aren't much documentation on Search API anymore. Any help would be appreciated. Thanks Kun ---- Kun Lin Systems and Application Librarian Whitman College PGP Public Key https://keybase.io/dnwklin/pgp_keys.asc