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Feb8 12 Last Modified: 2012-02-08 12:43:32 http://d32ogoqmya1dw8.cloudfront.net/files/NAGTWorkshops/time/visualizations_teachtips/historical_geology_timelines.pdf
Provenance Hand/computer created by Gwenn Ziegler, GCC Lab Tech. She has approved distribution and a list of original sources is included with the files.
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