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 1224.95 Bureau of Tendered Objects
• MS 6913.08 Floor 4022 the Silent Scriptorium

  Floor 4022, catalogued under the floor-name The Silent Scriptorium, is a western terrace of the Upper Stack administered as a scriptorium of…

• MS 7944.94 Petition of the Ninth Aperture
• MS 3171.43 Tidal Ledger

  The Tidal Ledger is the official apparatus, consisting of several thousand interlinked vellum folios and seventy-three calibrated brass meas…