| Answer | Crossword Clue |
|---|---|
| FOURTHCLASS | Book mailing category |
| FOURTHCLASS | Manuscript mailing category |
| MEDIA | Mailing category for reduced postage |
| FCLASS | Old mailing category that included library books |
| HOWTO | Book category |
| ADULT | Book category |
| SELF | ..-help (book category) |
| HOWTO | Practical-book category |
| FICT | Book category: Abbr. |
| TALLEST | Guinness Book category |
| ELHI | Educ. book category |
| RARE | Book collector's category |
| FASTEST | Guiness Book category |
| HOTTEST | Guinness Book weather record category |
