Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym HTD3 is...

HTD3 is

  • Herding Trial Dog, Third Level

HTD3 is also in:

Acronym Definition Searched: OBF TCXO MS BP WMSC NDSR RLB MAS RSR 57434 VC WARL 01128 AI 83628