Columbia subject headings:
Belgian newspapers--Belgium--Luxembourg--Directories.
Belgian periodicals--Belgium--Luxembourg--Directories.
Harvard subject headings:
Belgian newspapers--Belgium--Luxembourg (Province)--Directories.
Belgian newspapers--Belgium--Luxembourg--Directories.
Belgian periodicals--Belgium--Luxembourg (Province)--Directories.
Belgian periodicals--Belgium--Luxembourg--Directories.
Princeton subject headings:
Press--Belgium--Luxembourg--Bibliography.