Walker, John R. <br/><br/>
Exploring drafting : worksheets / 
John R. Walker, Bernard D. Mathis and Shauna Ann Scribner. 
 - 12th ed. - 
 - Tinley Park, IL:  The Goodheart- Willcox Company, Inc.,   c2018. 
 - 256 p. :  ill. ;  28 cm. 
<br/><br/><label>ISBN: </label>978-1-63126-266-1 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MechanicaL drawing.