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When Europe switched from Julian to Gregorian calendar. : r/europe
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The Gregorian Calendar Part 1 | Mysite 9 sept2018
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ROMAN JULIAN CALENDAR. German broadside, 1520 (Photos Framed Prints Puzzles...) #10414156
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British Museum — The Gregorian calendar
How many different Gregorian calendars are there? I'm assuming 14, one for Jan 1 starting on each weekday plus another seven for the leap years. - Quora
Julian and Gregorian Calendar Calculator - High accuracy calculation
How Apple dealt with Gregorian Calendar. What a mess! | MacRumors Forums
