Related Clues:
- Monograph
- Leave in a hurry, slangily
- Student reading
- Preacher's reading
- Job, Joel or Jonah
- Reach via cell phone, maybe
- Course purchase
- Contact by phone, in a way
- Borders order
- Part of ISBN
- Primer
- With 39-Across, shelf neateners (and what the 17-, 30-, 50- and 64-Across answers begin with)
- Send a high-tech message
- Written part
- Musical credit