American Standard Recommended Practice for Drainage of Coal Mines (M6.1-1955, UDC 622.5): Revision of American Recommended Practice for Drainage of Coal Mines, M6-1931, Issues 566-573
American Standards Association · Leonard Obert · Manuel Gomez · Seth T. Reese · Walter Alfred Selvig · Francis Harold Gibson · John B. Goodman · Naomi W. Kearney · Wilbur I. Duvall · William Harlan Ode · Vernon Frank Parry
Jan 1956 · U.S. Government Printing Office