| item | description | category | filter | more on... |
| HAA | HaloAcetic Acid | Edu./Chemistry |
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| HAA | HAN: a language of the United States | Regional/Language Code /3 |
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| HAA | Hasvik, Norway | Regional/Airport Codes |
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| HAA | Heavy Anti Aircraft | Governmental/Military |
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| HAA | Height Above Airport | Other/Transportation |
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| HAA | Hepatitis Associated Antibodies | Medical/Physiology |
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| HAA | Hepatitis- Associated Antigen | Medical/Laboratory |
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| HAA | High Altitude Abort | Governmental/NASA |
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| HAA | High Altitude Airship | Governmental/NASA |
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| HAA | High Altitude Airship | Governmental/Military |
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| HAA | High Altitude Airship | Other/Transportation |
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| HAA | Hinsdale Adventist Academy | Edu./Schools |
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| HAA | Histiocytosis Association Of America | Non-Profit Organizations |
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| HAA | Hospice Association of America | Non-Profit Organizations |
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| HAA | Hospice Association of America | Business/Firms |
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