Volumes 13-25
Volume 13
Volume 14
- Plutarch
- Lives of the Noble Grecians and Romans
Volume 15
Volume 16
- Claudius Ptolemy
- Nicolaus Copernicus
- On the Revolutions of the Heavenly Spheres
- Johannes Kepler
- Epitome of Copernican Astronomy (Books IV-V)
- Concerning the Harmonies of the World (Book V)
Volume 17
Volume 18
Volumes 19-20
- St. Thomas Aquinas
- Summa Theologica (First part complete; selections from second and third parts and supplement)
Volume 21
- Dante Alighieri
- The Divine Comedy
- Inferno (Hell)
- Purgatorio
- Paradiso
Volume 22
- Geoffrey Chaucer
- Troilus and Criseyde
- Canterbury Tales
Volume 23
- Niccolò Machiavelli
- Thomas Hobbes
Volume 24
Volume 25