Originally Posted by
moondog
The library might be a good place to find information on Massachusetts, for example. However, in the case of China, I recommend you go to a book store instead (i.e. pace of change is such that older volumes aren't very useful). I like the Lonely Planet myself. Other options include Fodor's, Let's Go, Rouge Guide, etc.
My local library has all the latest (2009/2010) editions of all those travel books.
Those are the books I plan to read. I've always liked Frommers books, especially for Eupean destinations, but don't know if his book on China is very good. Fodors suggestions are usually a bit pricey, Lonely Planet's a bit of backpacky travel. But LP is good for itinerary planning.