Van Valkenburg M E <br/><br/>
Netwok analysis. 
Van Valkenburg M E 
 - 3 
 -  1974 
<br/><br/><label>Standard No.: </label>88415 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>D661:4, L4