1911 Encyclopædia Britannica, Volume 18… (1911)
“ The wonderful development of Minnesota as a flour-producing state began with the introduction of improved roller processes after 1870. Minneapolis is the chief flour-making centre of the world, and the cities at the “Head of the Lakes" (Duluth, Minnesota, and Superior, Wisconsin, considered industrially as one place) constitute the second largest centre. The towns of the Red River Valley, which are nearer to the great wheat belt, give promise of developing into great flouring cities. Next to flour, lumber and timber products rank in importance. ”
