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HCNHydrogen Cyanide (prussic acid, hydrocyanic acid)
HCNHigh Country News (Paonia, CO)
HCNHardware Change Notification
HCNHo-Chunk Nation
HCNHarford Cable Network (Bel Air, MD)
HCNHealth Communication Network
HCNHyperpolarisation-Activated Cyclic Nucleotide-Gated Channel (protein)
HCNHealth Card Number (universal health care; Canada)
HCNHispanic Communications Network (Washington, DC)
HCNHost Country National
HCNHospice Care Network (New York)
HCNHealth Care News (monthly publication; Heartland Institute)
HCNHeterogeneous Computer Network
HCNHollywood Citizen-News (Hollywood, CA)
HCNHealth Council of the Netherlands
HCNHeritage Conservation Network (India)
HCNHotel Confirmation Number (travel reservation)
HCNHypercube Connected Network
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