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地质学报 1924

ALEXANDRITEANDITSPOPULARITYASAGEM-STONEINNORTHCHINA

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INTRODUCTION.Thereasonforhavingthisshortpapermadepublicisnotsomuchastounfoldtheresultsofanyscientificinvestigationonthesubjectmatter,butratherasadirectoutcomeoftheresponsetotherepeatedinquiries,set

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