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International Fixed Calendar - Wikipedia
HISTORY of the 13-Month, 28-Day Calendar | CalendarTRUTH
The Death and Life of the 13-Month Calendar - Bloomberg
The world very nearly adopted a calendar with 13 months of 28 …
The Mystery of the 13-Month Calendar | by LordNeic - Medium
International Fixed Calendar: The 13-Month Calendar - Reader's Digest
The Celtic Moon Calendar – the 13 Month Lunar Version - Calendar …
International Fixed Calendar - Jeremy Aldrich
The Year Actually Has 13 Months, Not 12 - History of Yesterday
Calendar of 13 Months | Encyclopedia MDPI