Is there a dataset, database or API as large as WorldCat that allows for search by library of congress call number? Is there a raw dataset, database or API as large as WorldCat that allows for search by library of congress call number?
As far as possible I need to query all the works in the world. At least every book or monograph, or title that has been given an LOC call number. As for journals, congresses, journal articles, fresh research etc., I can exclude them. I don't need 100% everything, but something as large Worldcat. Hence, a single university library, as large as it may be, may not be sufficient.
I need to input some call number eg. Q179, and get all the titles under that call number. Is there such a thing? Preferably free also, but if really no choice, I am ok with subscription needed or need to purchase
WorldCat has two different interfaces. One allows you to search by LC Classification and one does not.
The first interface is the public one you get from https://www.worldcat.org/ :

This interface's Advanced Search does not have an option to search LC Classification or call numbers:

The second interface, OCLC FirstSearch, is available through subscription via your local academic or public library. You will need to access it from your academic institution or public library and log in with your institutional credentials or your library card:

This interface's Expert Search has an option to search the Library of Congress Call No.:

Type Q179 into the &quot;Search for&quot; box, select Library of Congress Call No. from the &quot;Indexed in&quot; dropdown, and click Search.
Results: