Hamm, Hans W. <br/><br/>
Low cost development of small water power sites   
by Hans W. Hamm. 
 - Maryland  Volunteers in Technical  1967 
 - iii, 43p. 
<br/><br/><label>ISBN: </label>0866190147 
<br/><br/><label>Dewey Class. No.: </label>621.312134  / N67