trying to find when my grt grt grandfather whent to usa 1870 he was on census olyphant blakley luserne .he is with his wife and children one born wales one usa .this is not correct spelling of name but on census it says cannot read or write.the correct spelling is gillgrass.he must have left about 1868. he was back in wales 1880.he is on 1881 census for wales. i am trying to find as much info as possible. thank you haydon