Nagel, Ernest. <br/><br/>
The structure of science;  problems in the logic of scientific explanation / 
Ernest Nagel 
 - New York :  Harcourt, Brace & World,  c1961 
 - xiii, 618p. ;  22cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Philosophy.