Columbia subject headings:
Harvard subject headings:
Greece--History--Constantine I, 1913-1917.
Victoria, Empress, consort of Frederick III, German Emperor, 1840-1901.
Princeton subject headings:
Queens--Germany--Correspondence.
Queens--Greece--Correspondence.
Sophia, Queen, consort of Constantine I, King of the Hellenes, 1870-1932--Correspondence.
Victoria, Empress, consort of Frederick III, German Emperor, 1840-1901--Correspondence.