Standard and/or project under the direct responsibility of ISO/TC 263 Secretariat	Stage	ICS
ISO/PRF 4657 Assessment specification of coalbed methane resources	50.00	73.020
ISO 18871:2015 Method of determining coalbed methane content	90.93	73.020
ISO 18875:2015 Coalbed methane exploration and development — Terms and definitions	90.93	73.020 01.040.73
ISO/DIS 23604 Method of determining specific surface area of coal	40.00	73.040

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