Floor 5,553
- Holdings shelved
- 4
- Survey
- incomplete
4 holdings are shelved on this floor. A shared floor records where volumes sit and nothing about what any of them says; these are neighbours, not relations.
- MS 2467.02 Class-3 Acoustic Zones
- MS 8542.80 Silent Couriers
- MS 2319.53 Sub-Audible Hum at Aperture 77-Gamma
- MS 9763.05 Wall-thickening