Ryan W S <br/><br/>
Increasing use of logical trees in the civil service 
Ryan W S; Willis V A C; Brook P W 
 - London  Her Majesty's Stationery Office      1970 
 - 21p  cm. 
 - Civil service department .
<br/><br/><label>Standard No.: </label>49530 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>V3,8:(B2895)'N7, L0