It is a cinematographic work, photographic work, work of applied art or anonymous work first published more than 75 years ago. (See Commons:Copyright rules by territory/Vietnam)
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It is another type of work, and the creator died more than 50 years ago.
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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.
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This work is in the public domain in the United States because it meets three requirements:
it was first published outside the United States (and not published in the U.S. within 30 days),
it was first published before 1 March 1989 without copyright notice or before 1964 without copyright renewal or before the source country established copyright relations with the United States,
it was in the public domain in its home country (Vietnam) on the URAA date (23 December 1998).
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Uploaded a work by Gouvernement général de l'Indochine from Souverains et notabilités d'Indochine, p. 86 {{Gallica |1=bpt6k15050191}} with UploadWizard