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Nathan MacKinnon, Avs furious that refs allow goal after Matt Calvert suffers head injury from blocked shot - CBSSports.com
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Blue Jackets player leaves pool of blood after blocking shot, then scores winning goal - SBNation.com
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Erik Johnson ripped the refs for not stopping play after Matt Calvert's scary injury - Article - Bardown
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UPDATED: Matt Calvert 'out indefinitely,' absence related to concussion issues - Colorado Hockey Now
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Avalanche Stanley Cup Final berth bittersweet for Matt Calvert as he begins new career in retirement - The Athletic
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Colorado Avalanche notebook: Regular-season schedule released; Matt Calvert retires from NHL | Sports | gazette.com
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