Columbia subject headings:
Harvard subject headings:
Puroretaria kagaku kenkyū--Indexes.
Puroretaria kagaku shiryō geppō--Indexes.
Puroretaria kagaku--Indexes.
Socialism--Japan--Periodicals--Indexes.
Princeton subject headings:
Puroretaria Kagaku Kenkyūjo--Periodicals.
Socialism--Japan--Periodicals.
Socialism--Periodicals.