Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym HCGS is...

HCGS is

Henry County Genealogical Services
Hope Creek Generating Station

More Meanings For HCGS:

Highlands County Genealogical Society
Harrison County Genealogical Society
Hubbard Center for Genome Studies
Human Corneal Growth Supplement
Henry County Genealogical Services
Hope Creek Generating Station

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