Columbia subject headings:
Harvard subject headings:
Authors, English--20th century--Biography--Congresses.
Douglas, Norman, 1868-1952--Congresses.
Douglas, Norman, 1868-1952--Friends and associates--Congresses.
Princeton subject headings:
Authors, English--20th century--Biography--Congresses.
Douglas, Norman, 1868-1952--Congresses.
Douglas, Norman, 1868-1952--Friends and associates--Congresses.