Estall, Robert C. <br/><br/>
A modern geography of the United States :  aspects of life and economy / 
by Robert Estall 
 - Harmondsworth :  Penguin,  1972 
 - xiii, 401 p. :  ill. ; maps, ;  20 cm. 
<br/><br/>Includes bibliographical references (p. 388-393) and index 
<br/><br/><label>ISBN: </label>0140213651 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>United States--Economic conditions--1971-1981