The Book of knowledge  v.2 

 - Maynard, Mass. :  Houghton Mifflin,  c1980 
 - 20 v. :  ill. (some col.), maps (some col.) 
<br/><br/><label>ISBN: </label>0717285014 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedias and dictionaries
<br/><br/><label>Dewey Class. No.: </label>R 031  / N532 1980 V.2