Hidden Thunder: Rock Art of the Upper Midwest mystery fetched up in Gichi Bitobig—a

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

In these charmingly illustrated pages

We stare at each other because we don't know which tribe

Stories of abuse

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

Hidden Thunder: Rock Art of the Upper Midwest mystery fetched up in Gichi Bitobig—aIn 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