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| Coleman, A. L., and K. B. Pigg. 2002. Taxodiaceous conifers from the middle Miocene Yakima Canyon flora, Washington State, USA. Arizona/Nevada Academy of Science, Abstracts. |
| Hansen, A., and K. B. Pigg. 2001. Taxodiaceous conifers from the middle Miocene Yakima Canyon flora, Washington State, USA. Botany 2001 Abstracts: 71. |