Category:Harmony-Quadrangle: Revision history

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    October 26, 2022

    • curprev 16:4916:49, October 26, 2022‎ Alan.Myers talk contribs‎ 1,816 bytes +1,816‎ Created page with "__NOTOC__ ==Mining in the Harmony Quadrangle== There are only two known mines in the Harmony Quadrangle, both surface mines that operated before 1868. In both cases, the coal was dug from the bed of the creek or at the water’s edge. The seam is not known, only that it was a thin coal less than 2 feet thick. ==Map and Directory PDF Download== [https://wikiimage.isgs.illinois.edu/ilmines/webfiles/topo-mines/Harmony.pdf Coal Mines In Illinois Harmony Quadrangle]</br> ==..."
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