• its author died before 1954;
• the death date of its author is not known, and it was created before 1904;
• it is an anonymous work, a pseudonymous work, or a work made for hire, and it was created before 1904.

The above provisions are contained in 17 U.S.C. § 303. See also this page for more information.

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You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. Note that a few countries have copyright terms longer than 75 years: Mexico has 100 years, Jamaica has 95 years, and Colombia has 80 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term.