Barrier pillars in the Southern field : anthracite region of Pennsylvania

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035 ‡a(OCoLC)8092028
100 1 ‡aAsh, S. H. ‡q(Simon Harry), ‡d1889-
245 1 0 ‡aBarrier pillars in the Southern field : ‡banthracite region of Pennsylvania / ‡cby S.H. Ash and H.D. Kynor.
260 ‡aWashington, D.C. : ‡bU.S. G.P.O., ‡c1953.
300 ‡aiv, 44 p. : ‡bill., maps ; ‡c26 cm.
490 0 ‡aBulletin / Bureau of Mines ; ‡v526.
500 ‡aTen folded maps in pocket.
504 ‡aBibliography: p. 44.
538 ‡aMode of access: Internet.
650 0 ‡aAnthracite coal ‡zPennsylvania.
650 0 ‡aBarrier pillars.
700 1 ‡aKynor, H. D.
CID ‡a102119916
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DAT 1 ‡a20170608090607.0 ‡b2024-08-16T18:01:15Z
DAT 2 ‡a2024-08-16T17:30:02Z ‡b2017-08-31T20:00:02Z
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