Houghton, P. S. <br/><br/>
Gears, spur, helical, bevel, and worm  a treatise for draughtsmen, shop superintendents, foreman, mechanics and students 
P. S. Houghton                                                
 - 2nd ed. 
 - Bombay  Asia Publishing House  1961 
 - xvi, 391p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gear<br/>Gears<br/>Machine tools<br/>Machinery<br/>NASA thesaurus
<br/><br/><label>Universal Decimal Class. No.: </label>621.833  / HOU