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References
- ↑ Kentucky Geological Survey (2011). "The Geological Time Scale v.3" (PDF). Kentucky Geological Survey. Retrieved 2013-06-03.
- ↑ "Geologic History Compressed into 1 Calendar Year". Timetoast. 2010. Retrieved 2013-06-03.
- ↑ Carrington, Richard (1956). A Guide to Earth History. Penguin Books. p. 64-65.
- ↑ Hambidge, Gove (1941). Climate and Man. p. 7.
- ↑ Muir, Ramsay (1940). Civilization and Liberty. Jonathan Cape. p. 15.
- ↑ Robinson, James Harvey (1921). The Mind in the Making. Harper & Brothers Publishing. p. 82-83.
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