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James E. Conrad, Edwin H. McKee; 40 Ar/ 39 Ar dating of vein amphibole from the Bayan Obo iron-rare earth element-niobium deposit, Inner Mongolia, China; constraints on mineralization and deposition of the Bayan Obo Group. Economic Geology 1992;; 87 (1): 185–188. doi: https://doi.org/10.2113/gsecongeo.87.1.185
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