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