2007-01-032022-02-032007-01-032022-02-03https://hdl.handle.net/11124/7273Date scanned: 2002-06-28.Figure 39 concreted drifts.Held in the Russell L. and Lyn Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines.Donor: United States Bureau of Mines.The diagram shows a cross section of single track and double track drifts.Rights management statement available at: http://library.mines.edu/digital/rights.htmlMine supportsMiningUnderground miningStillImage