The blind population of the United States, 1920
1928
191 pages : 25 cm At head of title: Department of commerce. William F. Whiting, secretary. Bureau of the census. W. M. Steuart, director "Prepared under the supervision of Dr. Joseph A. Hill, assistant to the director of the census, and Leon E. Truesdell, chief statistician for population. The text analysis was written by Dr. Harry Best, professor of sociology at the University of Kentucky."--p. 2
