Milne Library has access to many rich source materials, but sometimes the best things have to be sought. Museums house rich collections of multimedia and material culture often pertaining to very specific time periods. Furthermore, any museum worth its salt will probably have a manuscript collection or supplimentary library. Since you are a student at a licensed College, getting access to these special collections will most likely be easy and fun!
Image credit: http://www.rootsweb.ancestry.com/~nylchs/