Technology foundation course. The man-made world. Unit 5: Systems file 
by Open University 
 - Walton Hall  Bletchley Buckinghamshire, Open University press  1971 
<br/><br/><label>Subjects--Topical Terms: </label><br/>System Analysis
<br/><br/><label>Dewey Class. No.: </label>YA6 Op2/5