Columbia subject headings:
Harvard subject headings:
Astronomers--Germany--Congresses.
Astronomy--History--18th century--Congresses.
Cartography--18th century--Congresses.
Geography--History--18th century--Congresses.
Mathematicians--Germany--Congresses.
Mayer, Tobias, 1723-1762--Congresses.
Science--18th century--Congresses.
Princeton subject headings:
Astronomers--Germany--Congresses.
Cartography--18th century--Congresses.
Mathematicians--Germany--Congresses.
Mayer, Tobias, 1723-1762--Congresses.
Science--18th century--Congresses.