Duyn, J. Van. <br/><br/>
Practical systems and procedures manual   
by J. Van Duyn. 
 - Virginia  Reston publishing company,Inc.  1975 
 - ix,218p  incl. ind 
<br/><br/><label>ISBN: </label>0879096349 
<br/><br/><label>Dewey Class. No.: </label>001.61  / N75