Tests of Atmospheres in Chesapeake and Ohio Railroad Tunnels Between Clifton Forge, Virginia, and Hinto, West Virginia: 1927-1928
Daniel Harrington · Edwin Lee Rawlins · Eugene Delos Gardner · F. E. Cash · G. St. J. Perrott · Gordon Ray Hopkins · H. M. Lawrence · Harold Putnam Greenwald · John Roy Thoenen · Royd Ray Sayers · Thomas Varley · F. D. De Vaney · George Edward McElroy · J. J. Forbes · T. W. Johnson · F. Feehan
Jan 1928 · U.S. Department of the Interior, Bureau of Mines