00473    a2200181   4500001000700000003000400007005001700011008004100028020001800069082001600087100001600103245007100119260003200190300001000222653002700232653001400259700001800273150038OSt20211123171727.0                                          a9781842657201  a526.9bY15S1 aYan, Haowen1 aSurveying : principles and methodscby Haowen Yan and Weifang Yang  aOxfordbAlpha Sciencec2012  a318p.  aEnvironmental  Science  aSurveying  aYang, Weifang