| Answer | Crossword Clue |
|---|---|
| STL | Cards' cap letters |
| STL | Cards' cap monogram |
| STL | Inits. on a Card's cap |
| STL | Initials on a Card's cap. |
| STL | Cards letters |
| RSVP | Letters on reply cards |
| STL | Letters for baseball's Cards |
| THOSE | "Keep ... cards and letters coming!" |
| THOSE | "Keep ... cards and letters coming in!" |
