ISO INTERNATIONAL STANDARD 4657 Firstedition 2022-01 Assessment specification of coalbed methane resources Specifications d'évaluation des ressources en methane de houille Referencenumber IS04657:2022(E) TSO ISO2022 IS04657:2022(E) COPYRIGHTPROTECTEDDOCUMENT ISO2022 All rights reserved.Unless otherwise specified, or required in the context of its implementation, no part of this publication may bereproducedorutilizedotherwise inanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingon theinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherIsoattheaddressbelow orIso'smemberbodyinthecountryoftherequester. ISOcopyrightoffice CP401.Ch.deBlandonnet8 CH-1214Vernier,Geneva Phone:+41227490111 Email:copyright@iso.org Website:www.iso.org Published inSwitzerland ii IS02022-Allrightsreserved

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