Hardy, A. S.  1847-1930 <br/><br/>
Elements of quaternions / 
by A. S. Hardy 
 - Boston :  Ginn, Heath,  1881 
 - viii, 234, [8] p. ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Quaternions<br/>Vector analysis
<br/><br/><label>Dewey Class. No.: </label>512.893