Geomagnetism and Edmond Halley (1656-1742): Revision history

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1 April 2019

22 July 2014

16 May 2012

18 January 2012

20 July 2010

13 April 2010

18 February 2010

3 August 2009

22 March 2009

30 January 2009

29 September 2008

11 August 2008