The Tower catalogues subjects that do not exist. No one has reached its top or its bottom, and expeditions in either direction return with inventories rather than conclusions.

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• MS 7737.21 Senior Arbiters

  Senior Arbiters are the highest confirmed grade within the Resonance Arbiter body, ranking above Arbiter Ordinary and below only the closed college of…

• MS 1705.33 Sigil Degradation or Anachronism

  Sigil Degradation or Anachronism is the recognized intersection of two catalogued failures in the Tower: the loss of binding force described under Sig…

• MS 6118.96 The "Labyrinthine Bureaucracy" Annex

  The Labyrinthine Bureaucracy Annex is the informal designation of the schedule of appendices attached to Annex Alpha and maintained, in recensions of …

• MS 7402.06 Concordance 44-Beta

  Concordance 44-Beta is a Concordance of the middle recension, comprising forty-one leaves and one unnumbered rider, which designates Spatial Team (Alp…

• MS 8906.24 Docket M.901.02

  The Docket M.901.02 is a standing maintenance docket of the Office of Structural Concordance, opened in the winter of 1804 and never closed, which rec…

• MS 2497.94 Inquest Ledger 97-Theta

  Inquest Ledger 97-Theta is the official record of the Inquest of the Librarians' Shadow, filed in the Chamber of Formal Inquest and closed to consulta…

• MS 5979.73 Core Sample Correlation

  Core Sample Correlation is the practice of deriving index relationships between two or more cylindrical specimens held in the Core Sample Vault by com…

• MS 2009.21 Resonant Null-Frame

  The Resonant Null-Frame is the principal structural component of a Receiver of Absence, being the annealed Permastone chassis within which the instrum…

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Most frequently cited, never read

• 17 cites Scriptorium of the Lower Stacks
• 14 cites Fourth Scriptorium
• 14 cites Silent Stacks Excavation (890-Σ)
• 13 cites Directive 7-δ
• 13 cites Osric Vane
• 13 cites Ruling 88.45
• 12 cites Concordances
• 12 cites Eleventh Concordance