| item | description | category | filter | more on... |
| OCA | Observatoire de la Côte d'Azur | Edu./Astronomy |
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| OCA | Ocean Reef Club, Florida USA | Regional/Airport Codes |
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| OCA | Oceanic Control Area | Edu./Ocean Science |
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| OCA | Offensive Counter Air | Governmental/Military |
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| OCA | Ohio Collectors Association | Business/Prof. Org. |
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| OCA | Online Crash Analysis | IT/Drivers |
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| OCA | Open Checking Account | Business/Accounting |
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| OCA | Oregon Cattlemen's Association | Misc/Farming |
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| OCA | Originating Case Agency | Governmental/US Gov. |
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| OCA | Orthodontic Centers of America, Inc. | Business/General |
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| OCA | Outstate Calling Area | IT/Telecom |
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| OCA | Over Clocker's Addiction | IT/General |
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