| item | description | category | filter | more on... |
| OPAC | Office Proficiency Assessment And Certification | Business/Positions |
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| OPAC | Online Public Access Catalog | Edu./Universities |
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| OPAC | Online Public Access Catalog | Uncategorized |
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| OPAC | Ontario Property Assessment Corporation | Business/Firms |
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| OPAC | Open Public Access Catalog | Edu./Libraries |
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