Clarkesworld Issue 021
| Book | Clockwork Chickadee |
| Periodical Title | Clarkesworld |
| Editor in Chief | Neil Clarke |
| Publisher | Neil Clarke |
| Editor | Sean Wallace |
| Copyright Holder | Wyrm Publishing |
| Cover Artist | Eli Effenberger |
| Contributing Writer | Mary Robinette Kowal, Paul Jessup |
| Format | e-Zine |
| Language | English |
| Location | US |
| Cover Date | 2008-06 |
| Issue Number | 21 |
Added by Supernaut1970