There are no exceptions. Never, for any reason, should any portion of Chemical Abstracts leave the library. Only individuals who have been issued a key, and who have it with them, are allowed in the library after hours. Do not let anyone into the library after hours, even if you think they have been issued a key. Do not ask anyone to let you into the library.
Reference books are to be used in the library.
In rare instances, the full-time staff person will consider checking an item out for up to 24 hours on special request. For a Reference Book to leave the room, it must be checked out to you by Heather DeVries or the Physical Sciences Librarian. Do not take reference books out of the Library after normal hours, even if you plan to bring them back immediately. Do not check material back in yourself. If you do, and there is a problem, you will be responsible for paying any fines.