If you’re looking for a particularly obscure spell, Cornell might have some answers for you. The Cornell Witchcraft Collection includes over 3,000 titles that examine the history of persecuted witches. Although the collection—which the school started assembling in the late 19th century—focuses mostly on the theological aspects of treating witches as heretics, there are also Latin volumes on demonology and graphic depictions of the torture of suspected witches.Maybe there is a reason to go to Ithaca.
You have a collection of what?
Mental Floss has an awesome list of odd collections at the libraries of different universities. One of my favorites: