Notes on verification

Museum's own official site and multiple academic/bibliographic sources confirm 24 rooms, but Basque tourism board pages cite 23 salas, indicating a minor discrepancy possibly due to different counting conventions. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.838 clusters=4 claim_tier=notable | framework convergence=partial on Museum's own official self-description, repeated across academic articles, encyclopedic entries, and directories (upstreams: Museum's own official floor plan/exhibition description (EHU), Anton Erkoreka (museum director) publications in Gaceta Médica de Bilbao) — publishers independent, evidence may not be | kind=empirical eligibility=high]