The archive catalogue records every acquisition by year, subject and provenance. A reading room clerk cross-references each request against the shelf index before release. 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 raking light.
