Columbia subject headings:
Baltimore (Md.)--Politics and government.
Skilled labor--Political activity--Maryland--Baltimore--History.
Working class--Political activity--Maryland--Baltimore--History.
Harvard subject headings:
Baltimore (Md.)--Politics and government
Skilled labor--Maryland--Baltimore--Political activity--History.
Skilled labor--Political activity--Maryland--Baltimore.
Working class--Maryland--Baltimore--Political activity--History.
Working class--Political activity--Maryland--Baltimore.
Princeton subject headings:
Baltimore (Md.)--Politics and government.
Skilled labor--Maryland--Baltimore--Political activity--History.
Working class--Maryland--Baltimore--Political activity--History.