Columbia subject headings:
Gómez Z., Luis, 1905-
Railroads--Employees--Labor unions--Mexico.
Railroads--Mexico--Employees--Biography.
Railroads--Mexico.
Harvard subject headings:
Gómez Z., Luis, 1905-
Railroads--Employees--Labor unions--Mexico.
Railroads--Mexico
Railroads--Mexico--Employees--Biography.
Princeton subject headings:
Gómez Z., Luis, 1905-
Railroads--Employees--Labor unions--Mexico.
Railroads--Mexico--Employees--Biography.
Railroads--Mexico.