. "1842Z"^^ . "1921Z"^^ . "1921-08-08Z"^^ . "Ladd, George Trumbull"@en . "1842-01-19Z"^^ . "George Trumbull Ladd (January 19, 1842 \u2013 August 8, 1921) was an American philosopher, educator and psychologist."@en . . . . . . . "American psychologist, educator and philosopher" . "George Trumbull Ladd"@en . . . . . .