"R.D" . "Douglas"@en . "R. D. (Robert Douglas) Lockhart" . "D." . "Robert"@en . . "Robert Douglas Lockhart"@en . "R.D Lockhart" . "Lockhart"@en . "1987" . . . "Lockhart, R. D. (Robert Douglas)" . "Robert Douglas LOCKHART" . . "R." . "LOCKHART" . "Robert Douglas" . "Robert D. Lockhart" . "D. (Robert Douglas)" . . . "Robert Douglas Lockhart" . "R. D. Lockhart"@en . . "1894" . . "R.D. Lockhart"@nl-NL . . .