Book excerpt: A revised 5th edition of a classic hiking guide to one of the most-visited regions of Pennsylvania. Eastern Penssylvania offers a wealth of hiking opportunities: North Mountain is still wild and remote; the popular Poconos offer miles of litttle-traveled trails; and the Appalachian Trail follows South and Blue mountains on its journey across the state. This thoroughly revised and updated fourth edition includes hikes ranging from 4 to 22 miles in length. Each hike description includes step-by-step directions, a topo map, information on hiking time, distance and rise, and knowledgeable commentary on the human and natural history you'll encounter.