Columbia subject headings:
Astronomy--History--16th century.
Gemma, Cornelius, 1535-1579.
Medicine--History--16th century.
Harvard subject headings:
Astronomy--History--16th century.
Cosmology--History--16th century.
Gemma, Cornelius, 1535-1579.
Physics--History--16th century.
Princeton subject headings:
Astronomy--History--16th century.
Cosmology--History--16th century.
Gemma, Cornelius, 1535-1579.
Physics--History--16th century.