Columbia subject headings:
Agricultural laborers--Legal status, laws, etc.--California--Congresses.
Collective labor agreements--Agriculture--California--Congresses.
Industrial relations--California--Congresses.
Harvard subject headings:
Agricultural laborers--Legal status, laws, etc.--California--Congresses.
Collective labor agreements--Agriculture--California--Congresses.
Industrial relations--California--Congresses.
Princeton subject headings:
Agricultural laborers--Legal status, laws, etc.--California--Congresses.
Collective labor agreements--Agriculture--California--Congresses.
Industrial relations--California--Congresses.