DS DS/EN ISO 13503-2/A1
DS DSEN SO 13503-2A1 2009-DEC-01 Petroleum and natural gas ndustres - Completon fluds and materals - Part 2 Measurement of propertes of proppants used n hydraulc fracturng and gravel-packng operatons - Amendment 1 Addton of Annex B Proppand specfcaton