Nault, William H and  et al. Ed. <br/><br/>
World book encyclopedia U-V  Vol.20 
Nault, William H and  et al. Ed. 
 - 
 - World Book, Chicago  1995 
 - 430 p 
 - .
<br/><br/><label>Subjects--Topical Terms: </label><br/>General encyclopedic works
<br/><br/><label>Dewey Class. No.: </label>R 030  NAU-W.UV.20