Columbia subject headings:
Harvard subject headings:
Astronomical clocks--History.
Clocks and watches--History
Ducommun, François.
Homann, Johann Baptist, 1663-1724
Landeck, Zacharias.
Planetariums--History.
Princeton subject headings:
Astronomical clocks--History.
Clocks and watches--History.
Ducommun, François.
Homann, Johann Baptist, 1663-1724.
Landeck, Zacharias.
Planetariums--History.