Arkansas River / American Desert / Mississippi River / Red River / /
Organization
Oklahoma State Department of Education / US Census Bureau / US government / Oklahoma Department of Agriculture / Oklahoma Cooperative Extension Service / Earlier Editions and USDA National Agricultural Statistics Service / United States government / /
Person
Karen Reczuch / Francisco Vasquez de Coronado / Hernando de Soto / David / Stephen Long / Brian Pinkney / Bill Pickett / /