Armstrong, Richard. <br/><br/>
Powered ships :  the beginnings / 
Richard Armstrong. 
 - London :  Benn,  c1974. 
 - 144 p. : ill. 
<br/><br/><label>ISBN: </label>0510126111 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ships.<br/>Naval architecture.