Columbia subject headings:
Archives--Mexico--Catalogs.
Labor disputes--Mexico--Manuscripts--Indexes.
Working class--Mexico--Manuscripts--Indexes.
Harvard subject headings:
Archivo General de la Nación (Mexico)--Catalogs.
Labor disputes--Mexico--Cases--Bibliography--Catalogs.
Princeton subject headings:
Archives--Mexico--Inventories, calendars, etc.
Labor disputes--Mexico--Manuscripts--Catalogs.
Labor--Mexico--Manuscripts--Catalogs.