[47282847]

Many national libraries receive copies of “every” book published in the covered country. They don’t have to buy them.

https://en.wikipedia.org/wiki/National_library

[Groxx]

If you're going by the broad definition and lack of "is this like 1 or 1,000,000 buildings" numbers, note that it also says:

>Unlike public libraries, these rarely allow citizens to borrow books.

Which would make them fairly irrelevant for this thread.