The Cornell University’s Library Witchcraft Collection is part of the division of rare and manuscript collections. With over 3,000 titles available to the public, they are an invaluable resource for research. They also have a digital witchcraft collection, with 104 rare and old documents (in english) in digital format. Many of them relate directly to the Salem witch trials, which, apart from being a travesty, is a curious event that any witch should investigate.
So far everything I have read has a decidedly anti-witch bias, but these are still fascinating parts of our history, and hopefully, by studying the past we can avoid similar hysterias and religious intolerances.