Tennessee, the long, thin state stretching from the Great Smoky Mountains to the Mississippi River, is as richly varied in history as in terrain. And from Davy Crockett, "Old Hickory" Andrew Jackson, and presidential candidate Estes Kefauver's coonskin cap, it has derived the colorful image of a frontier state.

Tennessee has been a land of many kinds of frontiers—from the day in 1540 when Spaniards in armor, fevered for gold and glory, struggled along the river banks near present-day Memphis, to the latest developments in radiation research at today's complicated laboratories in Oak Ridge.