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| Howell, P. E., M. L. DeVore, E. H. Barman, and K. B. Pigg. 2003. Insect-plant interactions from the Miocene of Washington: permineralized lepidopteran coprolites. Georgia Academy of Science. Abstr. |
| DeVore, M. L., K. B. Pigg, and E. Barman. 2002. Plant-animal interactions from the Miocene: evidence from a permineralized flora. Geological Society of America, 2002 Denver Ann Meeting Abstr. |