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<br /> <br /> <br />POWDERHORN COAL COMPAPIY <br />7 <br />p~6 <br />W <br />r S <br />C <br />c <br />4 <br />k <br />0 <br />3 <br /> <br />°z <br />c <br />v <br />a <br />-A I <br />5 <br /> <br />o - -- -.... - - - ... -- -- <br />D---- ~ -'-- --- ---- -. _ ._ .-.._ ---- ---- --- ~- -~-- -- <br />D-- -- -~. __. -- ._.-,_... .. - ---------~ --- -- --- <br /> <br /> <br /> <br />• ~` • 0.919 Sy. <br /> <br />o ---- --------- --- .. -- - --- - L^~~ ~ D R D • Deb <br /> <br /> ~ R- £Xtricl~on H - I`T~, <br /> <br />•• <br />o - <br />- -- <br />-._... - .. ---- - ---- -- - - <br />0 /A DD 0 O DO !,b S Mn ~ mn O nn Anm 9nnn Innnn ~inm <br /> <br />~. 78% <br />,!!, off) - <br />Subsidence above room-and-pillar partial extraction workings following <br />pillar squeeze or failure. <br />J3000 <br />N <br />John F. Abel, Jr. (1982) <br />