Theodore J. Hoover.
Economics of mining.
R630815. Economics of mining. By Theodore J. Hoover. NM: revisions & additions. © 12May48; A22719. Mildred Brooke Hoover Willis, Rulda Hoover MacLean & Louise Hoover Hauselt (C); 5Apr76; R630815.
Mildred Brooke Hoover Willis, Rulda Hoover MacLean & Louise Hoover Hauselt|C