Boothroyd,F. <br/><br/>
How and why it works  Book I 

 -  Schofield and sims ltd, 
 - 128p.;  20cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural sciences and mathematics
<br/><br/><label>Dewey Class. No.: </label>507  / BOO