mechanization minerals a.re indeed the sinews of war. The British have shown that vulor can offset, to a remarkable...Tallahassee, Fla.; Garland Peyton, director, division of mines, mining, and geology, department of natural rnsources...Voskuil, mineral economist, State geological survey division, Urbann, Ill.; A. 0. Trowbridge, director, Iowa...Clrnrlottesville, Va.; Harold E. Culver, supervisor, division of geology, department of conservation and development...- - - - . - .. - _ - .. Carbon black, by G. R. Hopkins and H. Backus •... __ . ,. _ _ . _ .... ., Cement |