Plant biologist and former National Park Service ecologist William W. Dunmire and ethnobotanist Gail D. Tierney incorporate exhaustive research, including interviews with Indian elders, in two popular guidebooks that combine information on native and ancient traditional uses of wild plants with contemporary uses. Wild Plants of the Pueblo Province covers the pueblo villages of the Rio Grande valley, while their second book, Wild Plants of the Four Corners includes Chaco Canyon, Mesa Verde, and Canyon de Chelly.