2 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 2503.53 Security Protocol Sigma

  Security Protocol Sigma is a family of operational guidelines, classified under Sigma-class handling, for managing the immediate aftermath o…

• MS 9175.59 Vault of Spent Hours

  The Vault of Spent Hours is a secured repository on Floor 4,112 dedicated to the archival containment of exhausted, mis-measured, or procedu…