"Hidrología Estados Unidos Arizona." . . "Geology, Stratigraphic Paleozoic." . . "From 230 to 570 million years ago" . . "Springs Arizona Navajo Indian Reservation." . . "Navajo Indians." . . "Geological Survey (U.S.)," . . "United States. Bureau of Indian Affairs," . . "Estratigrafía Estados Unidos Arizona Paleozoico." . . "Navajo Tribe of Arizona, New Mexico & Utah," . . "Navajo Tribe of Arizona, New Mexico & Utah." . . . . . . . . . . . . "Spring flow from pre-Pennsylvanian rocks in the southwestern part of the Navajo Indian reservation, Arizona" . . . . . . "Spring flow from pre-Pennsylvanian rocks in the southwestern part of the Navajo Indian researvation, Arizona" . . "Spring flow from pre-Pennsylvanian rocks in the southwestern part of the Navajo Indian Reservation, Arizona"@en . "Spring flow from pre-Pennsylvanian rocks in the southwestern part of the Navajo Indian Reservation, Arizona" . "Spring flow from pre-Pennsylvanian rocks in the southwestern part of the Navajo indian reservation, Arizona : hydrogeology of the Navajo and Hopi indian reservatioins, Arizona, New Mexico, and Utah" . . . . . . . . . . . . . . .