Columbia subject headings:
Ferber, Johann Jakob, 1743-1790.
Nicolai, Friedrich, 1733-1811.
Harvard subject headings:
Ferber, Johann Jakob, 1743-1790.
Nicolai, Friedrich, 1733-1811.
Princeton subject headings:
Ferber, Johann Jakob, 1743-1790.
Nicolai, Friedrich, 1733-1811.