Columbia subject headings:
Harvard subject headings:
Hildegart, 1914-1933.
Sex instruction--Spain--History--20th century.
Sexual ethics--Spain--History--20th century.
World League for Sexual Reform.
Princeton subject headings:
Hildegart, 1914-1933.
Sex instruction--Spain--History--20th century.
Sexual ethics--Spain--History--20th century.
World League for Sexual Reform.