00641cam a22002291 4500 e 31000700 DLC 20260227111221.0 810903s1931 dcu 000 0 eng e 31000700 (OCoLC)29093732 DLC MnU OCoLC DLC premarc L777 .A73 no. 12 Greenleaf, Walter James, 1889- Careers. Electrical engineering ... Washington, D.C., U.S. Govt. print. off., 1931. ii, 11 p. 23 cm. Vocational guidance. Occupations. Electrical engineering. 21123 21123