Columbia subject headings:
Harvard subject headings:
Baeumker, Clemens, 1853-1924--Correspondence.
Philosophers--Germany--Correspondence
Wust, Peter, 1884-1940--Contemporaries.
Wust, Peter, 1884-1940--Correspondence.
Princeton subject headings:
Baeumker, Clemens, 1853-1924--Correspondence.
Philosophers--Germany--Correspondence.
Wust, Peter, 1884-1940--Correspondence.