Analyses of Samples of Delivered Coal: Collected from July 1, 1915 to January 1, 1922, with a Chapter on the Tidewater Pool Classifications, Issues 226-230
Galen Howell Clevenger · George Samuel Rice · Willard Walker Cutler · James Washington Paul · Lee Clyde Ilsley · Ned H. Snyder · Ernest J. Gleim · Martinus H. Caron · Max Wilhelm Von Bernewitz
Jan 1925 · U.S. Government Printing Office