Columbia subject headings:
Coal Strike, Colo., 1913-1914.
Company unions--United States--History--20th century.
King, William Lyon Mackenzie, 1874-1950.
Rockefeller, John D., Jr. (John Davison), 1874-1960.
Harvard subject headings:
Coal Strike, Colo., 1913-1914.
Company unions--United States--History--20th century.
King, William Lyon Mackenzie, 1874-1950
Rockefeller, John D., Jr. (John Davison), 1874-1960.
Princeton subject headings:
Coal Strike, Colo., 1913-1914.
Company unions--United States--History--20th century.
King, William Lyon Mackenzie, 1874-1950.
Rockefeller, John D., Jr. (John Davison), 1874-1960.