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,
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{{Information |Description={{en|1=Soviet calendar for 1930 showing Gregorian months, traditional seven-day week, five national holidays, plus colored five-day work week.}} |Source=Clive Foss, "Stalin's topsy-turvy work week", ''History Today'' '''54'''/9