Columbia subject headings:
Marriage--United States--History--20th century.
Young adults--United States--History--20th century.
Youth--United States--History--20th century.
Harvard subject headings:
Marriage--United States--History--20th century.
Young adults--United States--History--20th century.
Youth--United States--History--20th century.
Princeton subject headings:
Marriage--United States--History--20th century.
Young adults--United States--History--20th century.
Youth--United States--History--20th century.