Columbia subject headings:
Cosmology--History--Congresses.
Mechanics--History--Congresses.
Harvard subject headings:
Astronomy--Early works to 1800--Congresses.
Celestial mechanics--Early works to 1800--Congresses.
Cosmology--Early works to 1800--Congresses.
Princeton subject headings:
Cosmology--History--Congresses.
Mechanics--History--Congresses.