A multi-dimensional dataset of Ordovician to Silurian graptolite specimens for virtual examination, global correlation, and shale gas exploration by H.-H. Xu, Z.-B. Niu, Z.-B. Niu, Y.-S. Chen, X. Ma, X.-J. Tong, Y.-T. Sun, X.-Y. Dong, D.-N. Fan, S.-S. Song, Y.-Y. Zhu, N. Yang, Q. Xia

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