Watermanship Page: 16
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 Look ahead to check direction, look behind for
 Bob under breaking wave; do not fight undertow-it exists
only short distance below surface and wave action will advance
swimmer farther than undertow carries him back.
 Break through surface and repeat  and .
Figure 11. To swim in surf.
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United States. War Department. Watermanship, book, April 25, 1944; Washington, D.C.. (digital.library.unt.edu/ark:/67531/metadc96650/m1/22/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.