Columbia subject headings:
Labor leaders--Mexico--Interviews.
Labor unions--Mexico--History.
Lombardo Toledano, Vicente, 1894-1968--Interviews.
Socialism--Mexico.
Harvard subject headings:
Labor leaders--Mexico--Interviews.
Labor unions--Mexico--History.
Lombardo Toledano, Vicente, 1894-1968--Interviews.
Socialism--Mexico--History.
Princeton subject headings:
Labor leaders--Mexico--Interviews.
Labor unions--Mexico--History.
Lombardo Toledano, Vicente, 1894-1968--Interviews.
Socialism--Mexico--History.