Air photographs of the Four Corners region, in Wengerd, S.A., ed., Geological symposium of the Four Corners Region

Wengerd, S.A., and Lamsens, O.R., Jr., 1952, Air photographs of the Four Corners region, in Wengerd, S.A., ed., Geological symposium of the Four Corners Region: Four Corners Geological Society, p. 12-21.