Feng, Yongqian. <br/><br/>
Bei fang shi di yan jiu / 
Feng Yongqian zhu. 
 - Di 1 ban. 
 - Zhengzhou Shi :  Zhongzhou gu ji chu ban she,  1994. 
 - 4, 3, 420 p. :  ill., maps ;  27 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>7534813638 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>China--Historical geography.
<br/><br/><label>LC Class. No.: </label>CHI00908