Columbia subject headings:
Cohn, Jonas, 1869-1947--Correspondence.
Philosophers--Germany--Correspondence.
Psychologists--Germany--Correspondence.
Stern, William, 1871-1938--Correspondence.
Harvard subject headings:
Cohn, Jonas, 1869-1947--Correspondence.
Philosophers--Germany--Correspondence
Psychologists--Germany--Correspondence.
Stern, William, 1871-1938. Correspondence.
Princeton subject headings:
Cohn, Jonas, 1869-1947--Correspondence.
Psychologists--Germany--Correspondence.
Stern, William, 1871-1938 / Correspondence.