. . . . . "Power centers"@en . "Power centers" . . . "A superpower of its age, the Maya grew from a marginal ethnic group to Central America's dominant military, cultural and mercantile society, all without the benefit of metal tools or beasts of burden." . "A superpower of its age, the Maya grew from a marginal ethnic group to Central America's dominant military, cultural and mercantile society, all without the benefit of metal tools or beasts of burden."@en . . "History" . . "Nonfiction television programs"@en . "History"@en . . "The ancient Maya power centers" . "The ancient Maya power centers"@en . . . "Documentary television programs"@en . . . . . . . . . .