Columbia subject headings:
Harvard subject headings:
Authors, Spanish--19th century--Correspondence
Cueto, Leopoldo Augusto de, marques de Valmar, 1815-1901--Correspondence.
Diplomats--Spain--Correspondence.
Russia--Description and travel.
Valera, Juan, 1824-1905. Correspondence
Princeton subject headings:
Authors, Spanish--19th century--Travel.
Russia--Description and travel.
Valera, Juan, 1824-1905--Travel--Russia.