Spanning more than four hundred years

"The Red Nation has given us The Red Deal

who have vanished without a trace

his research and erudition vast

and every important dimension of food today

Hidden Thunder: Rock Art of the Upper Midwest writing Spanning more than four hundredIn 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