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Ecotourism (Bmkhue)

Computer viruses ()
Transportation operations (B)
     Related Term (Associative): Management and organization (C)
    Travel (Bm)
         Use For: Journeys; Trips
        Travel demand (Bmk)
             Use For: Travel models (Travel demand)
             Related Term (Associative): Computer viruses ()
            Trip purpose (Bmkh)
                Tourism (Bmkhu)
                     Use For: Tourist trade
                     Related Term (Associative): Cruise lines (Nbbcma)
                    Ecotourism (Bmkhue)
                         Related Term (Associative): Environmental protection (Jfc)