Columbia subject headings:
Authors, English--20th century--Correspondence.
Hopkins, Kenneth--Correspondence.
Powys, Llewelyn, 1884-1939--Correspondence.
Harvard subject headings:
Authors, English--20th century--Correspondence
Hopkins, Kenneth
Powys, Llewelyn, 1884-1939
Princeton subject headings:
Authors, English--20th century--Correspondence.
Hopkins, Kenneth.
Powys, Llewelyn, 1884-1939.