This is an old postcard advertising The Romance of a Christmas Card by Kate Douglas Wiggin, ©1915/16. The card was probably issued about the same time as the book.was published.
The book has been digitized by the Gutenberg Project, and there are links to read it in various formats here. The other book mentioned on the postcard, The Birds' Christmas Carol, can also be found on the Project Gutenberg website here.
book cover as shown by Project Gutenberg
Kate Douglas Wiggin (1856–1923) was an American educator and author, best known for the classic children's novel Rebecca of Sunnybrook Farm.
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