Columbia subject headings:
Harvard subject headings:
Chemists--Germany--Correspondence.
Erdmann, Otto Linné, 1804-1869--Correspondence.
Liebig, Justus, Freiherr von, 1803-1873--Correspondence.
Princeton subject headings:
Chemists--Germany--Correspondence.
Erdmann, Otto Linné, 1804-1869--Correspondence.
Liebig, Justus, Freiherr von, 1803-1873--Correspondence.