| item | description | category | filter | more on... |
| RRN | Race Reports Net | Radio Stations |
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| RRN | Rally Racing News | Radio Stations |
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| RRN | Rapid Response Network | Governmental/US Gov. |
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| RRN | Rapid Response Network | Governmental/Military |
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| RRN | Rapid Response Network | Governmental/NASA |
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| RRN | Red River of the North | Edu./Geology |
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| RRN | Red River of the North | Edu./Ocean Science |
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| RRN | Relative Record Number | Uncategorized |
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| RRN | Research Resource Network | Non-Profit Organizations |
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| RRN | Rodeo Radio Network | Radio Stations |
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| RRN | Route Reestablishment Notification | IT/Networking |
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| RRN | Serra Norte, PA, Brazil | Regional/Airport Codes |
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