This non-U.S. work was published in 1931 or later, but is in the public domain in the United States because it was simultaneously published (within 30 days) in the U.S. and in its source country (Britain) and is in the public domain in the U.S. as a U.S. work (no copyright registered, or not renewed).
For background information, see the explanations on Non-U.S. copyrights. Photograph 1910s and available on multiple websites
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