. . "Robert Smithson"@en . . . "1938-01-02Z"^^ . . "Robert Irving Smithson"@en . "1973-07-20Z"^^ . "1938Z"^^ . . "Smithson, Robert"@en . "American artist" . "Robert Smithson (January 2, 1938 \u2013 July 20, 1973) was an American artist famous for his use of photography in relation to sculpture and land art."@en . . "1973Z"^^ .