Columbia subject headings:
Chemists--Germany--Correspondence.
Hofmann, August Wilhelm von, 1818-1892.
Liebig, Justus, Freiherr von, 1803-1873.
Harvard subject headings:
Chemists--Germany--Correspondence.
Hofmann, August Wilhelm von, 1818-1892--Correspondence.
Liebig, Justus, Freiherr von, 1803-1873--Correspondence.
Princeton subject headings:
Chemists--Germany--Correspondence.
Hofmann, August Wilhelm von, 1818-1892.
Liebig, Justus, Freiherr von, 1803-1873.