| Title / Condition | Highlights | Price |
|---|---|---|
| On Formally Undecidable Propositions of Principia Mathematica and Related Systems. Translated by B. Meltzer. Introduction by R. B. Braithwaite. GÖDEL, Kurt (1906-1978): / Used - Hardcover | 1st Edition | $250.00 |
| Conjectures & Refutations: The Growth of Scientific Knowledge Popper, Karl / Used - Hardcover | 1st Edition Dust Jacket | $150.00 |