Columbia subject headings:
Harvard subject headings:
Astronomers--Germany--Correspondence.
Astronomy--History
Astronomy--Observations
Bessel, F. W. (Friedrich Wilhelm), 1784-1846--Correspondence.
Bode, Johann Elert, 1747-1826--Correspondence.
Mathematicians--Germany--Correspondence.
Mathematics--History.
Princeton subject headings:
Bessel, F. W. (Friedrich Wilhelm), 1784-1846--Correspondence.
Bode, Johann Elert, 1747-1826--Correspondence.