. . . . . "Blackburn"@en . "Harriett"@en . "BLACKBURN" . "H." . "Ruth H. Blackburn" . . "RUTH" . . . "Ruth H." . . "RUTH H. BLACKBURN" . "Ruth Harriet Blackburn" . "Harriet" . "Ruth H. Blackburn"@nl-NL . "Ruth Harriett Blackburn"@en . . . "Ruth"@en . "Ruth Harriett BLACKBURN" . . "1915" .