Gray, Elisha,  1835-1901 <br/><br/>
Electricity and Magnetism  [electronic resource] / 
Elisha Gray 
 -  Project Gutenberg,  2010 
 - Project Gutenberg  34221 .
<br/><br/> Nature's Miracles, Volume III 
<br/><br/> Public domain in the USA. 
<br/><br/>Electronic text