Columbia subject headings:
K. R. (Konstantin Romanov), Grand Duke of Russia, 1858-1915--Correspondence.
K. R. (Konstantin Romanov), Grand Duke of Russia, 1858-1915--Diaries.
Harvard subject headings:
K. R. (Konstantin Romanov), Grand Duke of Russia, 1858-1915--Correspondence.
K. R. (Konstantin Romanov), Grand Duke of Russia, 1858-1915--Diaries.
Princeton subject headings:
K. R. (Konstantin Romanov), Grand Duke of Russia, 1858-1915--Correspondence.
K. R. (Konstantin Romanov), Grand Duke of Russia, 1858-1915--Diaries.