File:Experimental study on permeability characteristics of gas-containing raw coal under different stress conditions.pdf
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![File:Experimental study on permeability characteristics of gas-containing raw coal under different stress conditions.pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Experimental_study_on_permeability_characteristics_of_gas-containing_raw_coal_under_different_stress_conditions.pdf/page1-413px-Experimental_study_on_permeability_characteristics_of_gas-containing_raw_coal_under_different_stress_conditions.pdf.jpg?20240615143706)
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