Relative pressure changes in coal pillars during extraction : a progress report

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086 0 ‡aI 28.23:6980
100 1 ‡aCurth, Ernest A.
245 1 0 ‡aRelative pressure changes in coal pillars during extraction : ‡ba progress report / ‡cby Ernest A. Curth.
260 ‡a[Washington, D.C.] : ‡bU.S. Dept. of the Interior, Bureau of Mines, ‡c1967.
300 ‡a20 p. : ‡bill. ; ‡c27 cm.
336 ‡atext ‡btxt ‡2rdacontent
337 ‡acomputer ‡bc ‡2rdamedia
338 ‡aonline resource ‡bcr ‡2rdacarrier
490 0 ‡aReport of investigations / United States Department of the Interior, Bureau of Mines ; ‡v6980
500 ‡a"July 1967"--Cover.
504 ‡aBibliography: p. 18-19.
538 ‡aMode of access: Internet.
650 0 ‡aCoal mines and mining. ‡0http://id.loc.gov/authorities/subjects/sh85027364
650 0 ‡aMining engineering. ‡0http://id.loc.gov/authorities/subjects/sh85085712
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