The geology of the north Shensi basin has been studied to some detail bythe American geologists Fuller,Clapp and others~1 in an oil exploration partysent out in 1914 under the joint auspices of the Chinese National Oil Administra-
孫雲鑄.1933. GRAPTOLITE-BEARING STRATA OF CHINA[J]. ACTA GEOLOGICA SINICA(English edition),12(0):291~299
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