Helmholtz H <br/><br/>
Popular lectures on scientfic subjects   
  

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 - London  Longmans  1881 
 - 265, 21 cms, plates 
<br/><br/> B   
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<br/><br/><label>ISBN: </label>
<br/><br/><label>Dewey Class. No.: </label>504 hel/pop