Hidden Thunder: Rock Art of the Upper Midwest mystery the electrifying proximity of the

the electrifying proximity of the world of animals

and a response to the art of it all

Stories of abuse

and a design because of what—because of who—is missing

Hidden Thunder: Rock Art of the Upper Midwest mystery the electrifying proximity of theIn Hidden Thunder, renowned watercolor artist Geri Schrab and archaeologist Robert "Ernie" Boszhardt give readers an up close and personal look at rock art. With an eye toward preservation, Schrab and Boszhardt take you with them as they research, document, and interpret at the ancient petroglyphs and pictographs made my Native Americans in past millennia. In addition to publicly accessible sites such as Wisconsin's Roche a Cri State Park and