Hartree Douglas R <br/><br/>
Calculating instruments and machines 

 - Urbana  University of illinois press      1949 
 - 138  cm. 
<br/><br/><label>Standard No.: </label>11,149 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>INDUSTRIAL ARTS
<br/><br/><label>Dewey Class. No.: </label>MBl, J3