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Hubs (Bbhead)

Transportation operations (B)
     Related Term (Associative): Management and organization (C)
    Freight and passenger services (Bb)
        Routes and routing (Bbh)
            Routes (Bbhe)
                Hub and spoke systems (Bbhea)
                    Hubs (Bbhead)
                         Related Term (Associative): Airports (Pmfc)