Holiday greeting cards: Before Hallmark, we had postcards.

Tis the Season: The History of the Christmas Card.

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First Christmas, Forever Memories: 9 Newlywed Christmas Cards that Last a Lifetime

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Vintage Holiday Cards from the Digital Archive - Arts & Culture

Why are paper Christmas cards still a thing? Millennials, for once, are to thank. – Chicago Tribune

A Few Facts About Greeting Cards — From All Of Us At NPR : NPR

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