Hidden Thunder: Rock Art of the Upper Midwest mystery In these charmingly illustrated pages

In these charmingly illustrated pages

Many Dakota people consider the area to be their sacred place of origin as well as a site of genocide

fetched up in Gichi Bitobig—a stony harbor now known as Grand Marais

and a response to the art of it all

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

Hidden Thunder: Rock Art of the Upper Midwest mystery In these charmingly illustrated pagesIn 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