File:Katyn Massacre - Mass Graves.jpg
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 (Poland) on the URAA date (1 January 1996).
