پرونده:Демьянов, Николай Яковлевич.jpg

این اثر در کشورهایی و مناطقی که مدت زمان حق تکثیر، عمر پدیدآورنده بعلاوه 70 سال یا کمتر بعد از مرگ او است، در مالکیت عمومی قرار دارد.

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