Pratchett, Terry,  <br/><br/>
The science of discworld 

 - 414 pages ;   20 cm 
<br/><br/> Includes indexes 
<br/><br/><label>ISBN: </label>9780804168946 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cosmology. ; Discworld (Imaginary place).
<br/><br/><label>Dewey Class. No.: </label>523.1