In my geological reconnaissance in east Yunnan in 1914 I collected from a series of shales, sandstones and impure limestones, which underly the Lower DeVonian beds containing Arthrostigma gracile, a large number of small, but
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.1932. A STATISTICAL STUDY OF THE DIFFERENCE BETWEEN THE WIDTH-HEIGHT RATIO OF SPIRIFER TINGI AND THAT OF SPIRIFER HSIEHI.[J]. Acta Geologica Sinica(),11(4):
