Columbia subject headings:
Gauss, Carl Friedrich, 1777-1855.
Physicists--Correspondence.
Zimmermann, Eberhard August Wilhelm von, 1743-1815.
Harvard subject headings:
Princeton subject headings:
Gauss, Carl Friedrich, 1777-1855--Correspondence.
Mathematicians--Germany--Correspondence.
Zimmermann, Eberhard August Wilhelm von, 1743-1815--Correspondence.