7 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 5813.14 Acoustic Cartography Unit
• MS 3135.01 Class 1 — Attested
• MS 5492.46 Dependency Tracing

  Dependency Tracing is the standardized method of resolving disputes regarding measurement fidelity within the Tower by constructing a tree o…

• MS 4518.30 Floor 4,002

  Floor 4,002 is a transitional or "vestibule" floor, administratively situated between Floor 4001 and Floor 4,200. It is formally catalogued …

• MS 0280.93 Physical Archive Compromise
• MS 8354.04 Seal-Bearer
• MS 5463.52 Second Reconciliatory Session