| Answer | Crossword Clue |
|---|---|
| INCUNABULA | Books printed before 1501 |
| INCUNABULA | Books printed before 1500. |
| INCUNABULA | Books printed before 1500 A.D. |
| MDI | Year before which books known as incunabula were printed |
| ICONS | Printed plates in scientific books. |
| GLOSSILY | How photography books are usually printed |
