Columbia subject headings:
Harvard subject headings:
Freud, Sigmund, 1856-1939--Correspondence.
Nietzsche, Friedrich Wilhelm, 1844-1900. Correspondence
Paneth, Josef--Correspondence.
Paneth, Sofie--Correspondence.
Physiologists--Austria--Biography.
Princeton subject headings:
Paneth, Josef, 1857-1890--Correspondence.
Paneth, Josef, 1857-1890.