Columbia subject headings:
Harvard subject headings:
Germans--Latin America--Congresses.
Germans--Mexico--Congresses.
Immigrants--Mexico--Congresses.
Political refugees--Germany--Congresses.
Political refugees--Mexico--Congresses.
Princeton subject headings:
Exiles' writings, German--Mexico--Congresses.
Germans--Mexico--Congresses.
Mexico--Intellectual life--Congresses.