"Types and causes of tidal cycles". U.S. National Oceanic and Atmospheric Administration (NOAA) National Ocean Service (Education section). Archived from the original on 2012-02-01. Retrieved 2013-01-27.
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"Types and causes of tidal cycles". U.S. National Oceanic and Atmospheric Administration (NOAA) National Ocean Service (Education section). Archived from the original on 2012-02-01. Retrieved 2013-01-27.