Columbia subject headings:
Early childhood education--Government policy--Japan--History--20th century.
Early childhood education--Japan--Regional disparities--History--20th century.
Harvard subject headings:
Early childhood education--Government policy--Japan--History--20th century.
Early childhood education--Japan--Regional disparities.
Princeton subject headings:
Early childhood education--Government policy--Japan--History--20th century.
Early childhood education--Japan--Regional disparities--History--20th century.