Technical drawing book 3 
Mayock  F.B. 
 - 2nd ed. 
 - London.  Heinemann educational books,  1971. 
 - 38p. 
<br/><br/><label>ISBN: </label>0-435-75591-9 
<br/><br/><label>LC Class. No.: </label>T353  / .M39 1971