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The government source (PNSAA) says the well "must have been" dug in the Yuan dynasty, i.e. more than two centuries prior to the 1592 date currently listed in the article. This reference also says that "there is no precise document regarding when the Four-eyed Well was dug," which calls the 1592 date into further question. I propose changing the date of establishment to "1271–1368 (Yuan dynasty)". Phlar (talk) 05:02, 19 December 2016 (UTC)[reply]