01085cam a2200313Ia 4500011397709MiAaHDL20141009010000.0m d cr bn ---auaua900530s1929 dcua f001 0 eng 29026301 sdr-uiuc2954813UC 30095974ATF-9466(OCoLC)26429458DLCKEUUIUUIUUTN23.U4 no. 285Greenwald, H. P.(Harold Putnam),b. 1893.Coal-mine ventilation factors /by H.P. Greenwald and G.E. McElroy.Washington :U.S. G.P.O.,1929.v, 106 p. :ill. ;24 cm.Bulletin (United States. Bureau of Mines) ;285Includes index.At head of title: Department of Commerce. William F. Whiting, secretary. Bureau of Mines. Scott Turner, director.Mode of access: Internet.Coal mines and mining.Mine ventilation.McElroy, G. E.(George Edward),b. 1889.01139770920030811044718.020141009010000.020141112162027.02025-01-17T20:22:23Z2025-01-17T18:30:02ZSDR-UIUCUNKNOWNloader.pl-003-020BKsdr-uiuc2954813uiugSDRUIUCuiug.30112104112229UIUno. 2852954813UIUUIUC20250117googleuiug.30112104112229no. 2851929pdbibUS fed doc