Hacker, Louis Morton, <br/><br/>
The United States in the 20th century 
by Louis M. Hacker and Helene Zahler. 
 - New York  Appleton-Century-Crofts  [1952] 
 - xvi, 695 p.  illus., ports., maps.  25 cm. 
<br/><br/>Bibliography: p. 639-678. 
<br/><br/><label>LCCN: </label>52004187  
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States--History--20th century.
<br/><br/><label>LC Class. No.: </label>E741  / .H27 
<br/><br/><label>Dewey Class. No.: </label>973.91