Although you can't browse and there's no librarian on staff you can write and ask the Park Service to do the research, or get some specific sources by request. It made Eric's year. The Park's a wonderful resource. Unlike a battlefield where you only talk about maybe one day, I can branch out a talk about 8 years and what went on. In just one winter there's 13,000 stories.
Winter is the right time to visit the hallowed ground and listen to the stories.
The Morristown Official National Park Handbook 120 is an engaging summary of both the American history that took place in Morristown and of the Park itself.