Columbia subject headings:
Libraries--Special collections--Newspapers--Congresses.
Newspaper and periodical libraries--Congresses.
Newspapers in microform--Congresses.
Newspapers--Conservation and restoration--Congresses.
Harvard subject headings:
Libraries--Special collections--Newspapers--Congresses.
Newspaper and periodical libraries--Congresses.
Newspapers in microform--Congresses.
Newspapers--Conservation and restoration--Congresses.
Serials control systems--Congresses.
Princeton subject headings:
Libraries--Special collections--Newspapers--Congresses.
Newspaper and periodical libraries--Congresses.
Newspapers in microform--Congresses.
Newspapers--Conservation and restoration--Congresses.
Serials control systems--Congresses.