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   "abstract": "Geodetic  leveling  by  the  U.S.  Geological  Survey provides  a  framework  of  accurate  elevations  for  topographic  mapping.  Elevations  are  referred  to  the  Sea Level  Datum  of  1929.  Lines  of  leveling  may  be  run either  with  automatic  or  with  precise  spirit  levels,  by either  the  center-wire  or  the  three-wire  method.  For future  use,  the  surveys  are  monumented  with  bench marks,  using  standard  metal  tablets  or  other  marking devices.  The  elevations  are  adjusted  by  least  squares or  other  suitable  method  and  are  published  in  lists  of control.",
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