Is "Santa Claus in Camp (published in "Harper's Weekly," January 3, 1863)" in the public domain?

Yes, Santa Claus in Camp (published in "Harper's Weekly," January 3, 1863) is in the public domain and available for free download under CC0 license.

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Santa Claus in Camp (published in "Harper's Weekly," January 3, 1863)

This artwork was created originally published 1863.

Thomas Nast, originally published 1863