SPINES
| Date | Clue |
|---|---|
| 2017-07-07 | Things seen on a bookshelf |
| 2015-09-13 | Quills |
| 2013-04-21 | Cactus features |
| 2011-05-26 | Features of hedgehogs |
| 2008-03-16 | Bookcase lineup |
| 2006-03-14 | Places for book titles |
| 2005-05-07 | Library patrons read them |
| 1999-10-04 | Quills |
| 1997-09-15 | Vertebral columns |
| 1997-01-05 | Quills |
| 1996-12-26 | Porcupine quills |
| 1995-07-10 | Backbones |
| 1995-03-17 | Book parts |
| 1994-09-17 | Echidna features |
| 1993-12-08 | Places for titles |