Vols. for 1949-1950 is a combined issue; 1991- issued in parts.
Coverage of publications outside the UK and in non-English languages expands steadily until, in 1991, it occupies enough of the Guide to require publication in parts.
English newspapers--Directories. English periodicals--Directories. Newspapers--Directories. Periodicals--Directories. Presse--Répertoires.--Grande-Bretagne English newspapers. English periodicals. Newspapers. Periodicals.