benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 gr47 Granite_1947_USGS, 1994-03-21,  WKG ,  USGS ,  ASHTECH LM-XII3,  762,  7A,  ASH700228A,  0745,  NONE, 1.2493, 1.2981, 30, 193530