Regarding the books which have been removed, I am talking about from the library closest to my home (which is in a small city on the edge of a biggest city of the state). Though some evolution books from the 1980s and older (ones I needed use to look up quotes from the WT Creation book of the 1980s, are gone many other much newer evolution books are there, including newer editions of Darwin's Origin of the Species book.)
Entire shelves of reference books (including ones on science and technology), including a set of Britannica Encyclopedia were removed, without them being offered for sale to patrons of the library. I was told that was because people hardly use them anymore, especially since people can find up to date reference information on the internet now. It was also because the library did so to free up space to install study rooms in that area for patrons; they said patrons wanted more of such rooms. However, the small city library does subscribe to the online Britannica Encyclopedia and provides free access to it to patrons of the library. The library also got rid of all of the microfiche (and machine viewing machines for such) and most of all of their microfilm (but keeping the NY Times microfilm), saying now people hardly request such. They said it was also because the big library in the big city has such. [In contrast the large old central library branch for the big city seems to
hold onto their books forever, and I've seem many atheist books there.]
The Friends of the local small city library conducts large events of book (and DVD and CD) sales (mostly of books and other items donated to them, but some are ex-libary items from the small city library), to raise funds for the small city library. The sales take place inside the library - one will take place from this Wednesday through Sunday (with Sunday being clearance pricing day).
One of the former reference desk librarians (in my small city) was a devout Christian (who is also very nice) and I got the impression she probably decided to remove some of the atheist books since I know she had authority to decide which books to order for the library and which to remove from the library. But I don't know if she removed any atheist books. I don't even know if any atheistic books have been removed, I just thought some were since I don't seem to see as many on the shelves as I did before, but perhaps those are simply checked out more frequently now. Reference desk librarians have told me they track usage of items in the library. When items are hardly checked out they remove them and order something else which they think will interest patrons more. The library has much less space than the central branch of the big city library (which even has closed stacks of shelves of books and off-site storage). There is a book case in the library (or used to be such, but maybe now it is in the Friends store) of books which the library offers for sale (as ex-library books) very cheap - but more than 95% of those are fiction.