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2023 An Upper Palaeolithic Proto-writing System and Phenological Calendar
Art of the Upper Paleolithic
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History of writing
Gregorian calendar
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ELI5: Why does the year zero not exist? : explainlikeimfive
https://www.reddit.com/r/explainlikeimfive/comments/simm33/eli5_why_does_the_year_zero_not_exist/
Calendars