@article{160409,
      note = {Shipping list no.: 94-0403-P.},
      author = {Castle, Robert O. and Mark, Robert K. and Shaw, Roger H.},
      url = {http://library.usi.edu/record/160409},
      title = {An empirical assessment of refraction error in leveling as  a function of survey order and environment : an analysis of  the results of three North Anerican field experiments  designed to measure the systematic component of the  atmospheric refraction error in leveling /},
      publisher = {U.S. G.P.O. ;},
      recid = {160409},
      pages = {v, 50 p. :},
      address = {Washington :},
      year = {1994},
}