Columbia subject headings:
Harvard subject headings:
Chemists--Germany--Heidelberg--Biography--19th century.
Chemists--Germany--Heidelberg--Biography.
Chemists--History--19th century.
Chemists--History.
Gmelin, Leopold, 1788-1853.
Princeton subject headings:
Chemists--Germany--Heidelberg--Biography--19th century.
Chemists--History--19th century.
Gmelin, Leopold, 1788-1853.