Columbia subject headings:
Fries, Jakob Friedrich, 1773-1843--Congresses.
Knowledge, Theory of--Congresses.
Natural history--Congresses.
Harvard subject headings:
Fries, Jakob Friedrich, 1773-1843--Congresses.
Knowledge, Theory of--Congresses
Natural history--Congresses
Princeton subject headings:
Fries, Jakob Friedrich, 1773-1843--Congresses.
Knowledge, Theory of--Congresses.
Natural history--Congresses.