Whitehead, Alfred North <br/><br/>
Principia mathematica 
by Alfred North Whitehead and Bertrand Russell. 
 - 2d ed. 
 - Cambridge [Eng.]  The University Press  1950- 
 - v.  27 cm. 
<br/><br/> "Second edition 1925-1927. Reprinted 1950." 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics<br/>Logic, Symbolic and mathematical<br/>Mathematics--Philosophy.