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Robuta

https://www.mdpi.com/2075-163X/8/3/104
Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield,...
The mineralogical and geochemical compositions of the Lopingian coals from an exploratory drill core (ZK4-1) in the Zhongliangshan Coalfield, southwestern...
mineralogicalgeochemicalcompositionslopingiancoals