Hempel, Carl G. <br/><br/>
Fundamentals of concept formation in empirical science 
Carl G. Hempel 
 - Chicago  University of Chicago Press  1972 
 - iii,93p.;  22cm.- 
 - International encyclopedia of unified science : foundation of the unity of science .
<br/><br/><label>Dewey Class. No.: </label>502  / HEM