here it is easier
one way: you go there and tell what do you need and they're giving it to you
or other way you're looking for the book in some weird computer and then click on it and lady gives you the book.
and the first way is more common (and of course it is also how it was done in my high school, you go there and take whatever you want just telling them what you've taken 😖mart: )
i haven't heard about it 😕