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Related Clues:
- Part of ISBN
- 50s ICBM
- With 39-Across, shelf neateners (and what the 17-, 30-, 50- and 64-Across answers begin with)
- Bearer of scales and plates
- Hit-the-road guide
- Early satellite launcher
- Musical credit
- Word with 10-Down
- Paperback, e.g.
- Mapquest alternative
- Encyclopedia volume, perhaps
- Ayn Rand title word
- Reserve officially
- Library tome
- Reference section offering