Columbia subject headings:
Harvard subject headings:
Cohen, Hermann, 1842-1918
Natorp, Paul, 1854-1924
Princeton subject headings:
Cohen, Hermann, 1842-1918--Correspondence.
Cohen, Hermann, 1842-1918.
Natorp, Paul, 1854-1924--Correspondence.
Natorp, Paul, 1854-1924.
Neo-Kantianism.
Philosophers--Germany (West)--Correspondence.