Ratti, Aurel De . <br/><br/>
Simple Scientific Experiments /  Textual Documents 
Aurel De Ratti. 
 - 1st ed. / 
 - London :  Percival Marshall & Co. ,  Nd. 
 - 69p. :  ill ;  22cm . 
<br/><br/><label>Subjects--Index Terms: </label>Scientific Experiments G-Mathematics 
<br/><br/><label>Dewey Class. No.: </label>500  / R 189 Si