Spencer, Herbert. <br/><br/>
First principles / 
by Herbert Spencer. 
 - 5th ed. 
 - New York, N.Y. :  A.L. Burt Company,  [1880?]. 
 - xv, 483 p. 
<br/><br/> Contents : The unknowable--The knowable. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Philosophy.