Columbia subject headings:
Harvard subject headings:
Butler, Tubal Uriah Buzz.
Labor unions--Political activity--Trinidad and Tobago.
Labor unions--Trinidad and Tobago--Officials and employees--Biography.
Labor unions--Trinidad and Tobago--Political activity.
Trinidad and Tobago--Politics and government.
Working class--Political activity--Trinidad and Tobago.
Working class--Trinidad and Tobago--Political activity.
Princeton subject headings:
Butler, Tubal Uriah Buzz.
Labor unions--Trinidad and Tobago--Officials and employees--Biography.
Labor unions--Trinidad and Tobago--Political activity.
Laboring and laboring classes--Trinidad and Tobago--Political activity.
Trinidad and Tobago--Politics and government.