Columbia subject headings:
Harvard subject headings:
Industrial hygiene--Periodicals--Indexes.
Industrial relations--Periodicals--Indexes.
Labor movement--Japan--Periodicals--Indexes.
Labor movement--Periodicals--Indexes.
Labor--Japan--Periodicals--Indexes.
Labor--Periodicals--Indexes.
Working class--Japan--Periodicals--Indexes.
Working class--Periodicals--Indexes.
Princeton subject headings:
Industrial hygiene--Periodicals--Indexes.
Industrial relations--Periodicals--Indexes.
Labor--Japan--Periodicals--Indexes.
Working class--Periodicals--Indexes.