| Title / Condition | Highlights | Price |
|---|---|---|
| On Problem-solving: 58 (Godkin Lectures at Harvard University) Karl Duncker / New - Hardcover | $252.74 | |
| On Problem-solving: 58 (Godkin Lectures at Harvard University) Karl Duncker / New - Hardcover | $204.05 | |
| English Philosophy Since 1900 G. J. Warnock / New - Hardcover | $105.19 | |
| English Philosophy Since 1900 G. J. Warnock / New - Hardcover | $90.28 |