Columbia subject headings:
Harvard subject headings:
Lázaro y Galdiano, José, 1862-1947--Correspondence.
Unamuno, Miguel de, 1864-1936. Correspondence.
Princeton subject headings:
Lázaro y Galdiano, José, 1862-1947--Correspondence.
Unamuno, Miguel de, 1864-1936--Correspondence.