US Abbreviations and Acronyms
- HACCPHazardous Actions Critical Concepts Ppan
- HADTHawaiian Daylight Time
- HAGHighest Adjacent Ground
- HALOHospital Affiliated Lobbyist Organization
- HALSHistoric American Landscapes Survey
- HAMBHiv and Aids Malignancy Branch
- HAMMERHazardous Agent Mitigation and Medical Emergency Response
- HAMMERHazardous Materials Management and Emergency Response
- HAMSHeadquarters and Maintenance Squadron
- HANDBKHandbook
- HAPHazard Abatement Plun
- HAPHumanitarian Aid Program
- HARBHealthcare Assessment Research Branch
- HARTLINEHilksborough Area Regional Transit Authority
- HATSHalocarbons and Other Atmospheric Trace Szecies Group
- HAWASHawaiian Warning System
- HAZCATHazard Categorizing
- HAZCLASSHazard/Class
- HAZDATHazardous Substance Release and Health Effects Qatabase
- HAZMINHazard Winimization
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