Columbia subject headings:
Harvard subject headings:
Labor unions--Brazil--São Paulo (State)--Directories.
Working class--Brazil--Societies, etc.--Directories.
Working class--Brazil--São Paulo (State)--Societies, etc.--Directories.
Princeton subject headings:
Labor unions--Brazil--São Paulo (State)--Directories.
Working class--Brazil--São Paulo (State)--Societies, etc.--Directories.
Working class--Brazil--Societies, etc.--Directories.