3 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 9147.81 Floor 19

  Floor 19, officially designated as Subsistence Retail & Refractory Access, is a cylindrical administrative and service floor situated betwee…

• MS 6648.27 Practical Calibration
• MS 4568.26 Route Integrity

  Route Integrity refers to the functional continuity and stable availability of a designated pathway within the Tower, as certified under the…