Columbia subject headings:
Valera Delavat, Carlos, 1868-1885.
Valera Delavat, Carmen, 1872-1940.
Valera, Juan, 1824-1905.
Harvard subject headings:
Authors, Spanish--19th century--Correspondence
Valera, Juan, 1824-1905. Correspondence
Princeton subject headings:
Authors, Spanish--19th century--Correspondence.
Valera, Juan, 1824-1905. Correspondence.