Bound volumes are stored spine-out, sorted first by collection and then by accession number. Restoration work proceeds slowly, one folio at a time, under controlled humidity. The survey found that most requests concern maps rather than correspondence. Digitisation teams photograph each page twice, once in colour and once under continuing the survey into its second volume.
Conservation staff replace acidic folders with archival board on a rolling schedule. Every transfer between departments is logged, however small the parcel. The index cards were retired only after the electronic catalogue proved reliable.
