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- Fossil Ecosystems (second ed.). Manson Publishing Ltd. pp. 94–96. ISBN 978-1-84076-623-3. "DNR". dnr.state.il.us. Archived from the original on June 5, 2007...14 KB (1,416 words) - 04:07, 10 May 2024
- Evolution of Fossil Ecosystems (2nd ed.). CRC Press. p. 133. ISBN 978-1-84076-623-3. Archived from the original on 15 February 2017. Retrieved 26 January...56 KB (5,672 words) - 11:21, 19 April 2024