Gray, Elisha,  1835-1901 <br/><br/>
Familiar Talks on Science—World-Building and Life. Earth, :  Air and Water.  [electronic resource] / 
Elisha Gray 
 -  Project Gutenberg,  2010 
 - Project Gutenberg  33405 .
<br/><br/> Public domain in the USA. 
<br/><br/>Electronic text