It might be worth a call or email to the Bicycle & Pedestrian Program Manager for Pennsylvania. Maybe he or she can steer you in the right direction to find some useful maps.

Here's a page that lists the bike coordinators in the US by state: http://www.bikewalk.org/contacts_lin...eped_coord.htm.

Also - I mentioned DeLorme yesterday in the context of mapping software. They also sell what they call their Atlas & Gazeteer for each state. The books are $19.95, and contain detailed maps. I didn't mention it yesterday because I was thinking more in the context of something you could carry with you - but I suppose that you could make copies of the relevant pages.