Ginzberg, Eli, 1911- The skilled work force of the United States. - [Washington] U.S. Dept. of Labor [1955] - [32] p. illus., maps. 21 x 27 cm. LCCN: l 55000281 Subjects--Topical Terms: Labor supply--United States. LC Class. No.: HD5724 / .G53 Gov. Doc. Class. No.: L 1.2:SK 3