Adams, David Keith. <br/><br/>
America in the twentieth century :  a study of the United States since 1917 / 
by D. K. Adams. 
 - London :  Cambridge U.P.,  1967. 
 - viii, 264 p. :  maps, tables.  22 cm. 
<br/><br/>Bibliography: p. 251-254. and index. 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States--History--20th century.
<br/><br/><label>Dewey Class. No.: </label>973.9  / ADA 1967