Engineering drawing and geometry / by Randolph P. Hoelscher and Clifford H. Springer. Hoelscher, Randolph P. (Randolph Philip), 1890- Springer, Clifford Harry, 1896- joint author. Mechanical drawing. Geometry, Descriptive. T353 .H625 1961 744.422 HOE Includes Index. New York : Wiley, c1961. c1961. 1961 Text various page. : eng