Columbia subject headings:
Harvard subject headings:
Mexicans--Cuba.
Mexico--Emigration and immigration.
Political refugees--Latin America.
Spaniards--Mexico
Princeton subject headings:
Mexico--History--Revolution, 1910-1920--Refugees--Cuba--Congresses.
Political refugees--Latin America--History--20th century--Congresses.
Political refugees--Mexico--History--20th century--Congresses.
Political refugees--Spain--History--20th century--Congresses.