Stratigraphy of the Cretaceous rocks and the Tertiary Ojo Alamo Sandstone, Navajo and Hopi Indian reservations, Arizona, New Mexico, and Utah /
by R. B. O'Sullivan...[et al.].
-- Washington : United States Government Printing Office, 1972
- 65 p. + map. --
(Geological Survey Professional Paper ; 521-E).