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 9922.25 Appendix Γ
• MS 9519.85 CLBW-Ξ.9
• MS 8561.31 Engine "Sigma"
• MS 9424.47 Spiral 42

  Spiral 42 is a non-sequentially designated vertical spiral shaft within the Tower, primarily serving as the administrative and residential a…