Columbia subject headings:
Harvard subject headings:
California--Emigration and immigration--History.
Foreign workers, Asian--California--History.
Foreign workers, Mexican--California--History.
Immigrants--California--History.
United States--Emigration and immigration--History.
Princeton subject headings:
Foreign workers, Asian--California--History.
Foreign workers, Mexican--California--History.
Immigrants--California--History.
United States--Emigration and immigration--History.