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PrHAPreliminary Hazard Analysis
PrHAProcess Hazard Analysis (chemical process safety, industrial process safety)
PrHAPresident of the Royal Hibernian Academy
PrHAParkland Regional Health Authority (Canada)
PrHAPetersburg Redevelopment and Housing Authority (est. 1968; Petersburg, VA)
PrHAPeople's Refreshment Houses Association (UK)
PrHAPolish Reining Horse Association
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