Townsend, Clarence Ellsworth. Introductory mechanical drawing / Clarence E. Townsend and Stephen F. Cleary. - London : J. Wiley & sons, inc., 1930. - 2 p.l., iii-xi, 302 p : illus., diagrs ; 24 cm. Subjects--Topical Terms: Mechanical drawing LC Class. No.: SPE 4576