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 - New York:  Instructional publishing,  c1996. 
 - 160 p.:  ill. (some col.); 
<br/><br/><label>ISBN: </label>0590491180 9780590491181 
<br/><br/><label>Subjects--Topical Terms: </label><br/>information sources
<br/><br/><label>Dewey Class. No.: </label>372.4