Hancock, H. Irving  1868-1922 <br/><br/>
Dave Darrin and the German Submarines :  Making a Clean-up of the Hun Sea Monsters  [electronic resource] / 
H. Irving Hancock 
 -  Project Gutenberg,  2012 
 - Project Gutenberg  41628 .
<br/><br/> Public domain in the USA. 
<br/><br/>Electronic text