| item | description | category | filter | more on... |
| OFO | Office of Fiscal Operations | Other/States-Local |
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| OFO | Ontario Field Ornithilogists | Non-Profit Organizations |
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| OFO | Operational Flight Profile | Other/Transportation |
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| OFO | Operational Flow Order | Business/General |
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| OFO | Oregon Field Ornithologists | Non-Profit Organizations |
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| OFO | Oval Flying Object | Governmental/Military |
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