Columbia subject headings:
Agricultural laborers--Labor unions--California.
Chavez, Cesar, 1927-1993.
Labor unions--Agricultural laborers--California.
Harvard subject headings:
Agricultural laborers--Labor unions--California.
Chavez, Cesar, 1927-1993
Princeton subject headings:
Agricultural laborers--Labor unions--California.
Chavez, Cesar, 1927-1993.