Columbia subject headings:
Astronomy--Early works to 1800.
Comets--Early works to 1800.
Harvard subject headings:
Astronomy--Early works to 1800
Comets--Early works to 1800
Princeton subject headings:
Astronomy--Early works to 1800.
Comets--1618.
Comets--Early works to 1800.
Galilei, Galileo, 1564-1642. Saggiatore. French
Grassi, Orazio, 1582?-1654. Libra astronomica ac philosophica. French.