For the countries where copyright ends 70 years after an author’s death, Public Domain Day 2023 was marked by the works of the educator Maria Montessori and those of the geographer Sven Hedinan. Learn more: https://diff.wikimedia.org/2023/01/01/public-domain-day-2023-opening-a-treasure-trove-of-art-science-and-literature/
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