Columbia subject headings:
Harvard subject headings:
Baudouin de Courtenay, Jan Niecisław, 1845-1929--Correspondence.
Philologists--Germany--Correspondence.
Philologists--Poland--Correspondence.
Schuchardt, Hugo, 1842-1927--Correspondence.
Princeton subject headings:
Baudouin de Courtenay, Jan Niecisław, 1845-1929--Correspondence.
Philologists--Correspondence.
Schuchardt, Hugo, 1842-1927--Correspondence.