benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 gr32 Green_1932_USC&GS, 1994-03-18,  G.A. MEANS ,  NGS ,  TRIMBLE 4000,  1502,  SST,  TRM14532.00,  0,  NONE, 2.22, 0, 30, 18310
 gr32 Green_1932_USC&GS, 2007-10-21,  GDH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII 1L00,  ASH701945E_M,  CR620022601,  NONE, 1.2491, 1.2979, 30, 30