What is a petroglyph? Who made them and why? What is rock rubbing? How is it made? In her book, Guide to Indigenous Rock Carvings, Beth Hill examines these questions. She gives a fascinating introduction to the subject of First Peoples Petroglyphs of the Northwest Coastal Region - BC, Washington, Oregon and Alaska. Beth Hill and her husband Ray have traveled the coast for close to 20 years, recording the known sites, and discovering others. Out of this came "Indian Petroglyphs of the Pacific Northwest" (Hancock House Publishers, 1978), with over 1,000 photos and illustrations. A truly comprehensive study.