Yeah, not much use for us here either, actually, pretty sure I'm the only one.
Sacred Order of Librarians was founded ... uh, a really really long time ago, and they tracked the movements of The Horde, which at that time was just demons. Since then it's grown to encompass most Supernatural Creepy Crawlies And Other Various & Sundry Critters, as well as notable hunters, just in case.
So there you go, history of the Libraries in a nutshell.