| item | description | category | filter | more on... |
| HACA | Haitian American Community Association | Business/Prof. Org. |
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| HACA | Historical Armed Combat Association | Business/Prof. Org. |
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| HACA | Housing Authority of the City of Austin | Other/States-Local |
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| HACA | Human Anti-Chimeric Antibody | Medical/Human Genome |
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| HACA | Human Antichimeric Antibodies | Medical/Physiology |
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