Parker, Steve <br/><br/>
Tunnels are round and other questions about building / 
Steve Parker 
 - 32 pages :  color illustrations ;  29 cm 
 - I wonder why series .
 - I wonder why series. .
<br/><br/> Includes index 
<br/><br/> Illustrations and text provide the answers to thirty-three unusual questions about buildings, tunnels, bridges, and machinery. 
<br/><br/> Primary 
<br/><br/><label>ISBN: </label>9781856975803 0753405229 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Buildings<br/>Earthmoving machinery<br/>Structural engineering<br/>Children's questions and answers
<br/><br/><label>Dewey Class. No.: </label>690