الفهرس 
acknowledgmentOnly 14 pages are availabe for public view
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Abstract
Oceanography is considered a young Science with roots
gOIng back only to the tirsc halt of the nineteenths cencury.
Within the boundaries of the modern oceanography there is an
important and interesting field which has a considerably more
respectable family. This significant field consists of the
studies of sea level and its variations. There are many.