National Geographic : 1947 Feb
Cc)National Geographic Society Kodachrome by Richard H.Stewart Piedra Parada Workmen Bear Baskets of Pottery, the Broken Relics of a Forgotten Mexican Tribe The valley is of limestone, which, being porous, holds no water; hence there is little population. Water-retaining sandstone forms the distant bluff. From itsfoot seeps a spring, the only water in a considerable distance. Therefore, both ancient and modern settlements were located on the site.