Ryan, Wilfrid Sims <br/><br/>
The increasing use of logical trees in the Civil Service / 
W. S. Ryan, V. A. C. Willis, P. W. Brook. 
 - London:   H.M.S.O,   1970.  
 - 20 p. :  ill. ;  25 cm. 
 -  13 .
<br/><br/><label>ISBN: </label>0116300469 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Algorithms<br/>Civil service--Communication systems
<br/><br/><label>Dewey Class. No.: </label>005.1