Watson, J.; Ash, S. R. (2006). A rare bipinnate microsporophyll attributable to the Cycadales from the Late Triassic Chinle Formation, Petrified Forest National Park, Arizona. Museum of Northern Arizona Bulletin. 62: 95-105.
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Watson, J.; Ash, S. R.
2006
A rare bipinnate microsporophyll attributable to the Cycadales from the Late Triassic Chinle Formation, Petrified Forest National Park, Arizona