| 521 | -- | 567 | Stefano Borgo, Claudio Masolo. Full Mereogeometries |
| 568 | -- | 599 | Lucius Schoenbaum. On the Syntax of Logic and Set Theory |
| 600 | -- | 627 | Katsumi Sasaki. Formulas in Modal Logic S4 |
| 628 | -- | 632 | Daniel J. Hill, Stephen K. McLeod. On Truth-Functionality |
| 633 | -- | 664 | Kevin C. Klement. The Functions of Russell's no class Theory |
| 665 | -- | 689 | Solomon Feferman, Thomas Strahm. Unfolding Finitist Arithmetic |