1. Pagiophyllum simpsonii, a new conifer from the Chinle Formation (Upper Triassic) of Arizona;Ash;Journal of Paleontology,1970
2. An Upper Triassic upland flora from North Central New Mexico, U.S.A.;Ash;Review of Palaeobotany and Palynology,1999
3. New cycadophytes from the Upper Triassic Chinle Formation of the southwestern United States;Ash;Paleobios,2001
4. A new Upper Triassic flora and associated invertebrate fossils from the basal beds of the Chinle Formation, near Cameron, Arizona;Ash;Paleobios,2005
5. The Upper Triassic fern Phlebobteris smithii (Daugherty) Arnold ant its spores;Ash;Palynology,1982