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OROOrono (Amtrak station code; Orono, ME)
OROOxford Reference Online
OROOak Ridge Office (US Department of Energy)
OROOne Reference Only
OROOak Ridge Operations (DOE)
OROOil Recovery Operations
OROOntario Regional Office (Ontario, Canada)
OROOffice of Regional Operations (EPA)
OROOperations Research Office
OROOriginal Registered Owner (legal term)
OROOnde Radio Ovest (band)
OROOffsite Response Organization
OROOperations Research Organization