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http://www.hartrao.ac.za/geodesy/THEIGSST.htm
Interesting paper "The IGS Station and its Role in Land Delivery in Zambia"
https://www.colorado.edu/geography/gcraft/notes/datum/edlist.html
There is an interesting article in Photogrammetric Engineering e Remote Sensing of Oct 2004 signed from prof. Cliff Mugnier that shares parameters from Arc Datum 1950 and Wgs84
From ISG http://www.isgeoid.polimi.it/Geoid/Africa/africa_pub_g.html