| item | description | category | filter | more on... |
| RO | Radar Operator | Governmental/NASA |
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| RO | Radon Occurrence | Medical/Physiology |
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| RO | Rahva Omakaitse (People’s Home Guard) | Governmental/Nazi Regime |
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| RO | Range Officer | Governmental/Military |
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| RO | Read Only | Edu./Physics |
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| RO | Read-Only | Uncategorized |
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| RO | Readout | Governmental/NASA |
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| RO | Rebel Outpost | Governmental/Military |
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| RO | Receive Only | Governmental/NASA |
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| RO | Recieve Only (TTY) | IT/Telecom |
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| RO | Recovery Operations | Governmental/NASA |
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| RO | Recruiting Officer | Governmental/Military |
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| RO | Red Outer | Misc/Colors |
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| RO | Red Oxide | Edu./Chemistry |
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| RO | Regional Office | Governmental/US Gov. |
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| RO | Repair and Overhaul | Governmental/NASA |
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| RO | Reproductive Organ | Medical/Physiology |
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| RO | Research Organization | Edu./Universities |
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| RO | Research Organization | Business/General |
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| RO | Results Of | Edu./Physics |
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