"1887-08-20Z"^^ . . . . . . "George Vernadsky"@en . "Vernadsky, George"@en . . . "1973-06-20Z"^^ . . . . . "1973Z"^^ . "George Vernadsky (August 20, 1887 \u2013 June 20, 1973), Russian: \u0413\u0435\u043E\u0301\u0440\u0433\u0438\u0439 \u0412\u043B\u0430\u0434\u0438\u0301\u043C\u0438\u0440\u043E\u0432\u0438\u0447 \u0412\u0435\u0440\u043D\u0430\u0301\u0434\u0441\u043A\u0438\u0439) was a Russian-born American historian and an author of numerous books on Russian history."@en . "1887Z"^^ . . "American historian" . .