01040cam a22002531 4500011397691MiAaHDL20141009010000.0m d cr bn ---auaua830616s1923 dcuaf f00010 eng dsdr-uiuc805735ADH-7535(OCoLC)9614704CNOCNOUIUHolbrook, Elmer Allen.Timbering of metal mines,by E.A. Holbrook, Richard V. Ageton, and Harry E. Tufft.Washington,Govt. print. off.,1923.vii, 72 p.illus., plates.24 cm.Bulletin / Bureau of Mines ;no. 215First edition, June 1923. cf. verso of t.-p.At head of title: ... Department of the interior. Hubert Work, secretary. Bureau of mines. H. Foster Bain, director.Most plates printed on both sides.Mode of access: Internet.Mine timberingTufft, Harry Earle,1884-Ageton, Richard Valentine,1887-01139769120020415161734.020141009010000.020141112162027.02025-01-01T18:49:46Z2025-01-01T18:30:02ZSDR-UIUCUNKNOWNloader.pl-003-020BKsdr-uiuc805735uiugSDRUIUCuiug.30112104112054UIUno. 215805735UIUUIUC20250101googleuiug.30112104112054no. 2151923pdbibUS fed doc