- OPR
- Ottawa & Prescott Railway (Regional » Railroads)* Operator (Governmental » Military)* Office of Primary Responsibility (Governmental » US Government)* Office of Primary Responsibility (Governmental » NASA)* Office of Primary Responsibility (Governmental » Military)* Office of Professional Responsibility (Governmental » FBI Files)* Old Parish Records (Medical)* Officer Performance Report (Governmental » Military)* Organization of Primary Responsibility (Governmental » Military)* Official Public Record (Governmental » US Government)* Oregon Pacific Railroad Company (Regional » Railroads)* Office Procedures Reinforcement (Business » General)* Ontario Pacific Railway (Regional » Railroads)Operating Performance Regime (International » Australian)
Abbreviations dictionary. 2012.