by Williams, Oliver P.
Moon handbooks. Pennsylvania
Rockhounding Pennsylvania and New Jersey : a guide to the states' best rockhounding sites
Pennsylvania Off the Beaten Path(r): Discover Your Fun
Pennsylvania good eats : exploring the state's favorite, unique, historic, and delicious foods
Hiking through history Pennsylvania : exploring the state's past by trail
Hiking waterfalls in Pennsylvania : a guide to the state's best waterfall hikes