An excellent resource in researching the Robben Island Bible:
A Book Behind Bars: The Robben Island Shakespeare, one of the Exhibitions at the Folger, opened on May 25, 2013 and closed on October 2, 2013. The exhibition highlights a 1970 edition of The Alexander Text of the Complete Works of Shakespeare that circulated throughout the Robben Island prison in South Africa from 1975 to 1978.
https://folgerpedia.folger.edu/A_Book_Behind_Bars:_The_Robben_Island_Shakespeare