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tides4fishing.com
"Tide table". Tides4fishing.com. Retrieved 17 July 2013.
"Calayan". Official Website of the Provincial Government of Cagayan. Archived from the original on 12 July 2014. Retrieved 15 July 2013.
"Municipality/City: Calayan". PSGC Interactive. National Statistical Coordination Board. Archived from the original on 16 November 2016. Retrieved 15 July 2013.