Columbia subject headings:
Fetus.
Medicine, Greek and Roman.
Premature infants.
Harvard subject headings:
Fetus--Early works to 1800.
Fetus.
Galen. De foetus formatione.
Medicine, Greek and Roman.
Premature infants--Early works to 1800.
Premature infants.
Princeton subject headings:
Fetus.
Medicine, Greek and Roman.
Premature infants.