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| Quantitative radiometric and biostratigraphic calibration of the Pennsylvanian-Early Permian (Cisuralian) time scale and pan-Euramerican chronostratigraphic correlation | | M. D. Schmitz | | | | Geological Society of America Bulletin(2012), 124(3-4):549 | | http://dx.doi.org/10.1130/B30385.1 |
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