Encyclopedia and unified science / 
[by] Otto Neurath . . [et al.] 
 - Chicago :  University of Chicago,  1946 
 - 78 p. ;  24 cm. 
 - International Encyclopedia of unified science ;  v.1, no.1 .
<br/><br/>Bibliography : p. 77-78 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic, Symbolic and mathematical