Columbia subject headings:
Gauss, Carl Friedrich, 1777-1855--Correspondence.
Hansteen, Christopher, 1784-1873--Correspondence.
Harvard subject headings:
Gauss, Carl Friedrich, 1777-1855--Correspondence.
Hansteen, Christopher, 1784-1873--Correspondence.
Princeton subject headings:
Astronomers--Norway--Correspondence.
Gauss, Carl Friedrich, 1777-1855--Correspondence.
Gauss, Carl Friedrich, 1777-1855.
Hansteen, Christopher, 1784-1873--Correspondence.
Hansteen, Christopher, 1784-1873.
Mathematicians--Germany--Correspondence.
Physicists--Norway--Correspondence.