Large US data update

I have today added 510 new records to the US data set. These records have been compiled from the Social Security Index that is available currently from the US government.

I have removed duplicates from the list where I have noted them, if I have missed any please let me know. I am working my way through another 1500 or so records from the same source but it is challenging cleaning the data and making it suitable for display on the site.