Columbia subject headings:
Ayala, Eusebio, 1875-1942.
Chaco War, 1932-1935--Diplomatic history--Sources.
Presidents--Paraguay--Correspondence.
Rivarola, Vicente.
Statesmen--Paraguay--Correspondence.
Harvard subject headings:
Ayala, Eusebio, 1875-1942.
Chaco War, 1932-1935--Diplomatic history--Sources.
Presidents--Paraguay--Correspondence.
Rivarola, Vicente.
Statesmen--Paraguay--Correspondence.
Princeton subject headings: