Columbia subject headings:
Archival resources--Russia (Federation)--Saint Petersburg.
Catholic Church--Poland--History--Sources--Bibliography--Catalogs.
Catholic Church--Russia--History--Sources--Bibliography--Catalogs.
Catholic Church--Soviet Union--History--Sources--Bibliography--Catalogs.
Harvard subject headings:
Archival resources--Russia (Federation)--Saint Petersburg.
Catholic Church--Poland--History--Sources--Bibliography--Catalogs.
Catholic Church--Russia--History--Sources--Bibliography--Catalogs.
Catholic Church--Soviet Union--History--Sources--Bibliography--Catalogs.
Princeton subject headings: