744 Lev P Levens, Alexander Sander, 1900- Problems in mechanical drawing, second course, 1958 edition [by] A.S. Levens and A.E. Edatrom . Keyed to Mechanical drawing by Fronch and Svensen . St. Louis, Webator Division, McGraw-Hill [1958] 1 t . (sin paginar) 50 diagrs. 28 cm .