SOUTHERN AFRICAN GEOMAGNETIC SECULAR VARIATION FROM 2005 TO 2009

A. GEESE, M. KORTE, P. B. KOTZE, V. LESUR
2011 South African Journal of Geology  
doi:10.2113/gssajg.114.3-4.515 fatcat:wokfp4gjvbds3ltgx2awqznlee