| item | description | category | filter | more on... |
| ORR | Office of Refugee Resettlement | Governmental/US Gov. |
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| ORR | Operational Readiness Review | Governmental/NASA |
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| ORR | Operations Requirements Review | Governmental/NASA |
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| ORR | Osage Railroad | Regional/Railroads |
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| ORR | Oxidation- Reduction Reaction | Edu./Chemistry |
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| ORR | Yorketown, South Australia, Australia | Regional/Airport Codes |
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