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Holmlund, Per (15 January 2007). "Tarfala in numbers". Department of Physical Geography and Quaternary Geology. Archived from the original on 4 March 2016. Retrieved 21 March 2012.
Hagström, Mirja D (10 December 2008). "A Brief Tarfala Chronology". Department of Physical Geography and Quaternary Geology. Archived from the original on 18 April 2013. Retrieved 21 March 2012.
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Holmlund, Per (15 January 2007). "Tarfala in numbers". Department of Physical Geography and Quaternary Geology. Archived from the original on 4 March 2016. Retrieved 21 March 2012.