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by underground methods The important ones are the Coal Mining loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader035vdocumentinreader035viewer2022071217604c8f55864a7d67e415b60ehtml5thumbnails5jpg width=140 height=200 divdivdiv class=ts-pagebutton class=gotoPage data-page=6Page 6button div class=ts-imageimg data-url=mining-and-control-control-surface-subsidence-due-to-extraction-of-coal-byhtmlpage=6 data-page=6 class=ts-thumb lazyload alt=Page 6: miningstcomminingstcomresourcesGround Mining and Control · control surface subsidence due to extraction of coal by underground methods The important ones are the Coal Mining loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader035vdocumentinreader035viewer2022071217604c8f55864a7d67e415b60ehtml5thumbnails6jpg width=140 height=200 divdivdiv 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