| item | description | category | filter | more on... |
| EFRF | Earth Fixed Reference Frame | Governmental/NASA |
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| EFRF | Earth Fixed Reference Frame | Edu./Astronomy |
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| EFRF | Educators For Reproductive Freedom | Non-Profit Organizations |
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| EFRF | Enhanced Frequency Response Function | Edu./Electronics |
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| EFRF | Equipment Failure Report Form | Governmental/NASA |
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| EFRF | Equipment Failure Report Form | Edu./Electronics |
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| EFRF | Equipment Failure Report Form | Governmental/Military |
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