Download or read book Hidden Thunder written by Geri Schrab and published by Wisconsin Historical Society. This book was released on 2016-09-13 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Hidden Thunder, archaeologist Robert "Ernie" Boszhardt and renowned watercolor artist Geri Schrab give readers an upcloseandpersonal look at rock art. With an eye toward preservation, Schrab and Boszhardt take you with them as they research, document, and interpret the ancient petroglyphs and pictographs made my Native Americans in past millennia. In addition to publicly accessible sites such as Minnesota's Jeffers Petroglyphs and Wisconsin's RocheaCri State Park, Hidden Thunder covers the artistic treasures found at several remote and inaccessible rock art sites--revealing the ancient stories through words, fullcolor photographs, and artistic renditions.