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 6774.58 Echo Containment

  Echo Containment is a specialized archival practice defined by Echo Archive Protocol 7.19-B as “the systematic sequestration of unverified o…

• MS 7550.21 Surveyor's Chain

  The Surveyor's Chain is a procedural doctrine used to establish traceable provenance for observations made during official expeditionary wor…