Columbia subject headings:
Ignatʹev, Nikolaĭ Pavlovich, graf, 1832-1908--Correspondence.
Ignatʹeva, E. L. (Ekaterina Leonidovna)--Correspondence.
Russo-Turkish War, 1877-1878--Sources.
Harvard subject headings:
Ignatʹev, Nikolaĭ Pavlovich, graf, 1832-1908--Correspondence.
Ignatʹeva, E. L. (Ekaterina Leonidovna)--Correspondence.
Russo-Turkish War, 1877-1878--Sources.
Princeton subject headings:
Ignatʹev, Nikolaĭ Pavlovich, graf, 1832-1908--Correspondence.
Ignatʹeva, E. L. (Ekaterina Leonidovna)--Correspondence.
Russo-Turkish War, 1877-1878--Sources.