Hartree, Douglas Rayner  1897-1958. <br/><br/>
Calculating instruments and machines 

 - Cambridge:   University press,   1950. 
 - ix, 138 p.  il., fot., graf.;  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculators<br/>CALCULADORES<br/>Mathematical instruments.
<br/><br/><label>Subjects--Index Terms: </label>Instrumentos matemáticos. 
<br/><br/><label>Universal Decimal Class. No.: </label>518.1