Clues to american's past
Brain, Jeffrey P.. / Copeland, Peter. / Haba, Luis de la. / ...
Washington D.C : National Geographic Society , 1976

The incredible Incas and their timeless land
Alarco, Eugenio. / Glanzman, Louis S.. / Mc. Intyre, Loren.
Washington, D.C. : National Geographic Society , 1975

The misterious Maya
Adams, Richard E. W.. / Harvey, David Alan. / Imboden, Otis. / ...
Washington, D.C. : National Geographic Society , 1977