Wolff, Doug. <br/><br/>
Drafting symbol sourcebook 
Doug Wolff 
 - Whitehouse Station  McGraw-Hill  1999. 
 - 343 p.  ill.  29cm. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0070713324 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mechanical drawing---Notation<br/>Signs and symbols