Wilson, H. B. <br/><br/>
Motivation of school work by H. B. Wilson and G. M. Wilson   

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 - Boston  Houghton Mifflin Co.  1916 
 - ix, 265 p. 
 -   .
<br/><br/><label>ISBN: </label>
<br/><br/><label>Dewey Class. No.: </label>370.1  / W749