E-block staging entry validated for model fit. Imported from staging batch duell-thimm-e, source entry 581. Normalized on 2026-08-08 as the canonical A. Dierkes sabre-fencing manual. Duplicate work 3349 was merged into work 863 so that the Prague 1857 Hess edition witness remains attached to a single canonical record.
Phase 580: title diacritics and abbreviated author authority normalized.