Columbia subject headings:
Biologists--Correspondence.
Bonnet, Charles, 1720-1793--Correspondence.
Haller, Albrecht von, 1708-1777--Correspondence.
Harvard subject headings:
Biologists--Correspondence.
Bonnet, Charles, 1720-1793--Correspondence.
Haller, Albrecht von, 1708-1777--Correspondence.
Princeton subject headings:
Biologists--Correspondence.
Bonnet, Charles, 1720-1793--Correspondence.
Haller, Albrecht von, 1708-1777--Correspondence.