Platts , John . <br/><br/>
A Companion to Wrigley`s Collection of Examples and Problems /  Textual Documents 
John Platts & Alfred Wrigley. 
 - 1st ed. / 
 - London :  Deighton,Beel And Co. ,  1861. 
 - 449p. :  ill ;  23cm . 
<br/><br/><label>ISBN: </label> HB 
<br/><br/><label>Subjects--Index Terms: </label>Mathematical Processes G-Mathematics 
<br/><br/><label>Dewey Class. No.: </label>511.9  / P 697 C