Columbia subject headings:
Chemistry--History.
Gearhart family.
Gerhardt, Ch., 1816-1856.
Webber family.
Harvard subject headings:
Chemistry--History
Chemists--France--Biography
Gearhart family.
Gerhardt, Ch., 1816-1856.
Webber family.
Princeton subject headings:
Chemistry--History.
Gearhart family.
Gerhardt, Ch., 1816-1856.
Webber family.