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Coalbed Methane-bearing Characteristics and Reservoir Physical Properties of Principal Target Areas in North China[J]. TANG Shuheng, SUN Shenglin, HAO Duohu and TANG Dazhen China University of Geosciences (Beijing), Beijing 100083;E-mail: tangshuhen@263.netChina National Administration of Coal Geology, Beijing 100039 China University of Mining and Technology (Beijing Campus), Beijing 100083.Acta Geologica Sinica(English Edition). 2004(03)