Johnson N <br/><br/>
Autocad the complete reference 

 - 1st 
 - New Delhi  Tata McGraw Hill Education Limited  1991 
 - 896 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mechanical Engineering
<br/><br/><label>Dewey Class. No.: </label>621.92  / JO-A