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Revision as of 09:22, 27 April 2009 (view source) imported>Chris Day No edit summary ← Older edit		Latest revision as of 18:56, 11 March 2022 (view source) Maintenance script (talk \| contribs) (== Summary == Importing file) Tag: Server-side upload
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	Imagined view "from above" of a mined seam of coal. Children in coal-mining areas sometimes can't resist exploring old drift mines, which can be especially dangerous. It is essential that such mines remain safely sealed from human exploration. Early mining methods led to irregularly spaced supports, which often were not even represented on maps at all, or were represented inaccurately. Modern mines have regular supports at safe intervals of known thickness.		== Summary ==
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