Well let's see. I live in Burke County. Have for 52 years. The only place there could be 5000 acres of "contiguos native prairie" would be Lostwood National Wildlife Refuge. A federal refuge, not privately owned. Native prairie means never been under the plow. As for the several thousand acres owned by ranchers, that would be in the Coteau Hills. That would be currently grazed in pasture. Some pretty rugged land,thus the "hills" part. Haven't seen a lot of corn up there lately. Earl Butz was sec. of ag. in the 70s not 50s. Pesky facts.