My relative George Owen emigrated on 19 Oct 1935 with his two children from Southampton, UK to Argentina via ship to Buenos Aires. He was an experienced railway engineer and family stories say helped build the Argentine rail network. The last known address was in Buenos Aires but I've had no reply.
Where would any immigration, census and employment records be found? What I do have is a passenger list on which he appears.
I have had had no success with main Family History websites.