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 - Chicago  University of Chicago Press         1998 
 - xi, 382p Bibliography chapterwise  cm. 
 - National Bureau of Economic Research Monograph .
<br/><br/><label>ISBN: </label>D and productivity: The econometric evidence 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Economics<br/>Research and Development